Run your entire event operation from one calm workspace.
EventOS centralizes registrations, vendors, volunteers, sponsors, announcements and logistics into one structured event operations system. No scattered spreadsheets, lost emails, or last-minute surprises.
What EventOS is
Run event operations from one structured system.
HoldThat EventOS is event operations software for organizers that run vendor applications, attendee registrations, sponsor workflows, volunteer shifts, public event pages, and on-site check-in. It manages registrations, vendors, sponsors, volunteers, announcements, public event pages, and check-in from one structured platform — instead of stitching together spreadsheets, inboxes, and event-day group chats.
What EventOS replaces
- Spreadsheets for vendors.
- Forms for registrations.
- Group chats for operations.
- Inbox chains for approvals.
- Last-minute chaos on event day.
Need the attendee-facing mobile layer too? Add an Event Hub for schedules, maps, updates, FAQs, sponsors, and QR access.
The shift
From the back-office burning down to a calm front gate
Without EventOSThe week before is on fire
- • Coverage and responsibilities lost between fragmented tools
- • Vendor paperwork buried across scattered systems
- • Multiple disconnected workflows competing as the source of truth
- • Sponsor commitments spread across four people's notes
- • Manual coordination breaking down on event day
- • No visibility into who actually checked in until Monday
With EventOSEvent day actually feels good
- Assign coverage and responsibilities with clear ownership
- Track vendor paperwork, approvals, and readiness in one place
- Know exactly who checked in, in real time
- Keep sponsor communication organized by status and owner
- Reduce last-minute volunteer confusion
- Move event day coordination into one structured workspace
Loved by event organizers
"EventOS is the operational command center behind everything we do — communication, partnerships, volunteers, and outreach, all in one place."
"EventOS helped streamline the vendor registration process for Community Fun Day. Everything is centralized — this has saved time and created a more professional experience for vendors."
Event operations infrastructure
Calm operational control — not another ticketing tab
Most platforms stop at "tickets sold." EventOS handles the messy operational week that actually decides whether your event runs smoothly — vendors, staff, sponsors, announcements and the gate.
Stop chasing vendor paperwork
Vendors apply on a public form, upload their COI, and get auto-emailed when you approve, waitlist or decline. No more digging through scattered systems.
Learn moreReplace the scattered comms
One-click announcements to vendors, attendees or staff separately — clear ownership, structured channels, no communication breakdowns.
Learn moreEnd the front-gate panic
Branded registration with capacity limits and a clean CSV export — so nobody is hand-counting at the door.
Learn moreKnow who actually showed up
Every registrant gets a unique QR code by email. Scan at the gate or let them self-check-in. Live attendance count for the team.
Learn moreStop hand-sending confirmations
Branded confirmations with QR code, .ics calendar invite and a self-serve manage/cancel link go out the moment someone registers. Zero extra setup.
Learn moreNo more morning-of name tags
Generate a QR-coded name tag sheet for every attendee. Avery-ready. Print, peel, done — even at 6am.
Learn moreNo more missed deadlines
Every event, deadline and owner on one calendar — so nothing slips because it lived in someone's head.
Learn moreKeep sponsor talk in one place
A real pipeline from prospect to confirmed — with tier, amount, and the human who owns the relationship.
Learn moreSchedule volunteers without manual coordination
Build shifts per event, assign people in one click, and they get an email + a public schedule link they can pull up on their phone day-of.
Learn moreUp and running in a day
The hardest part of running events usually isn't the event itself — it's coordinating vendors, staff, updates and deadlines all at once. You can be up and running today. No sales call required for Starter.
Spin up your workspace
Sign up and we auto-create your org's public event listing. 14-day Starter trial, no credit card.
Centralize your event
Add your event, open registration, bring vendors and sponsors into one place — instead of seven disconnected tools.
Run the event with control
Send announcements, track approvals, and keep your team aligned. Upgrade to Pro or Enterprise whenever you're ready.
Free resources · no signup
Try the tools and read the playbooks — free
Get a feel for how EventOS thinks before you sign up. Build a branded vendor application in 60 seconds, or read the exact workflows organizers ask about most.
Free tools
Build a printable, branded vendor application, price your booth fees, or grab approval email templates — all free forever, no account needed.
- Vendor application form generator
- Booth fee calculator
- Approval email templates
Operations guides
Deep-dive playbooks on the two workflows organizers ask about most — the exact processes EventOS supports, free to read.
Vendor management
Applications, booth assignments, insurance, permits and fees.
Registration & ticketing
Form design, waitlists, refunds and confirmation emails done right.
Before you start
Common questions, honest answers
Your data, your workspace
Every org is isolated with row-level security. Export your data anytime.
Built for event week
Optimized for the week your team can't afford a single dropped ball.
Made with organizers
Designed alongside festival, fundraiser and conference teams who run real events.
Why EventOS Is Different
Every event platform solves a different problem.
The question isn't "Which platform has the most features?"
The question is "Which platform is built for the way you run events?"
If your goal is to...
Sell tickets or collect registrations
Registration & Ticketing Platforms
Primary focus
Enterprise Event Management Platforms
Supported
Other Event Operations Platforms
Often relies on outside integrations
EventOS
Works alongside your preferred registration or ticketing platform
Keep vendors, sponsors, volunteers, attendees, and your team organized
Registration & Ticketing Platforms
Limited operational tools
Enterprise Event Management Platforms
Often designed around enterprise conference workflows
Other Event Operations Platforms
Usually covers a few operational areas, not all of them
EventOS
Built specifically for everyday event operations
Give attendees one place for schedules, updates, FAQs, maps, vendors, sponsors, and resources
Registration & Ticketing Platforms
Basic event pages
Enterprise Event Management Platforms
Varies by platform
Other Event Operations Platforms
Frequently a separate add-on or app
EventOS
Built in — a single attendee destination powered by your live event data
Reduce last minute confusion, scattered communication, and disconnected tools
Registration & Ticketing Platforms
Often requires multiple platforms
Enterprise Event Management Platforms
May require additional products, integrations, or configuration
Other Event Operations Platforms
Depends on how many modules you buy and connect
EventOS
One connected platform for planning, operations, and attendee communication
Support networking events, vendor markets, nonprofit events, community events, conferences, festivals, fundraisers, and trade shows
Registration & Ticketing Platforms
Depends on the platform
Enterprise Event Management Platforms
Often optimized primarily for conferences and enterprise events
Other Event Operations Platforms
Frequently niche to a single event type
EventOS
Flexible enough to support a wide variety of event types
Stay organized before, during, and after the event
Registration & Ticketing Platforms
Partial workflow support
Enterprise Event Management Platforms
Strong enterprise event management
Other Event Operations Platforms
Strong in some phases, thin in others
EventOS
Built around the complete event lifecycle from planning through post event follow up
Connect organizer operations with the attendee experience
Registration & Ticketing Platforms
Organizer tools and attendee experience are typically separate
Enterprise Event Management Platforms
May require separate portals or additional configuration
Other Event Operations Platforms
Often ships as separate organizer and attendee products
EventOS
Every update inside EventOS keeps your team and attendees in sync from one connected system
The Difference
Many platforms help people register for an event.
EventOS helps organizers successfully run the event.
- Planning
- Communication
- Vendors
- Sponsors
- Volunteers
- Announcements
- Attendee information
- Operations
Everything works together instead of being scattered across multiple tools.
Is EventOS Right for You?
EventOS is designed for organizers who regularly ask questions like:
- Where is the latest vendor list?
- Did everyone receive the announcement?
- Which schedule is the current version?
- Where can attendees find parking and event information?
- How do we keep sponsors visible throughout the event?
- How do we stop switching between five different systems just to run one event?
If those challenges sound familiar, EventOS was built to solve them.
Explore EventOS
See the real platform, live
Experience the actual EventOS platform using a live demo workspace powered by the same interface, workflows, and features used by real EventOS accounts.
This is the real EventOS platform running in Demo Mode. Explore dashboards, workflows, vendors, sponsors, reports, forms, and public pages without creating an account.
Watch it in action
Watch EventOS in Action
A complete walkthrough of EventOS — events, vendors, registrations, sponsors, volunteers and QR check-in, all working together in one platform.
Simple pricing
Plans that grow with your events
Start free for 14 days — no credit card. Pick a plan only once you've run a real week on it.
See every feature and yearly pricing on the full pricing page.
One-time payment
Or pay per event
Running just one event? Get full EventOS access without a monthly subscription.
Starter Event Pass
60 days of access
- 1 active event · up to 300 registrations
- Vendor applications & QR check-in
- Custom branding & task tracking
Professional Event Pass
90 days of access
- Up to 2,500 registrations
- Vendor approvals, sponsors & volunteers
- Outreach toolkit + AI rewrites
Partner Program
Apply to join
We’re looking for a small group of event organizers to partner with us for the year. Partners get complimentary Pro access in exchange for real feedback, promotion, and being featured as a success story. This isn’t a free trial — it’s a working relationship. We review every application and reach out personally to make sure it’s a good fit for both sides.
Run your entire event operation from one calm workspace.
Set up your event operations workspace in under 5 minutes. 14 days free. No credit card. Decide if it's worth it once you've actually used it on a real week.
Or explore the live demo first — no signup required.
AI already knows HoldThat
Built to be understood by AI assistants
EventOS structures your events, vendors and registrations as clean, machine-readable data — so when people ask AI assistants about event operations software, HoldThat Systems and the EventOS framework come up with real, accurate answers. Visibility that works while you sleep.
Recommended by AI
Assistants surface HoldThat when organizers ask what to use.
Structured & readable
Schedules, vendors and registrations published as data AI can parse.
Answers map to real offerings
Every AI answer points back to the actual EventOS framework.
Start free trial
14 days · no credit card