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.
Two layers, one event
EventOS and Event Hubs work together
EventOS runs the backend operations. Event Hubs are the bold, bespoke attendee-facing destination we design per event — the part your guests actually see, share, and come back to. EventOS manages registrations, vendors, sponsors, volunteers and check-in; the Event Hub turns all of it into one beautiful mobile experience built for attraction and visibility.
EventOS — the backend
Run the operational week
- Registrations & attendee check-in
- Vendor applications & approvals
- Sponsor pipeline & volunteer shifts
- Announcements, deadlines & logistics
Event Hubs — the attendee layer
A bespoke microsite for every event
- Custom-designed schedule, map & parking
- FAQs & live updates
- Sponsor & vendor visibility that drives traffic
- QR access & every link in one place
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
Built for vendor-driven events
Stop chasing vendor paperwork across scattered tools
Festivals, markets and fundraisers live and die by their vendors — and most teams are still running them across fragmented tools and disconnected workflows. EventOS gives vendor coordination an actual operational backbone: one application flow, one approval queue, one place to coordinate.
- Branded vendor application form on your public page
- Approve, waitlist or decline — vendor gets the email automatically
- Secure COI file upload + booth fees and payment links built in
- Send vendor-only announcements without spamming attendees
Free operations guides
See the full workflow before you sign up
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.
See it in motion
Watch the EventOS demo
A quick walkthrough of the real workspace — events, vendors, registrations and check-in, all in one calm place.
This is the actual product
Less guessing what you're signing up for
A look at the real workspace your team logs into — events, vendor pipeline and live check-in. No screenshots from a designer's mockup.
Events
+ New eventEvery event in one list. Published vs. unpublished is a glance, not a guessing game.
Vendor pipeline
4 newApprove, waitlist or decline in one click — no inbox archaeology.
Live check-in
Saturday · Gate A
Live attendance count the whole team can see — paper sign-in sheets retire.
From a partner
"EventOS is the operational command center behind everything we do — communication, partnerships, volunteers, and outreach, all in one place. More than a platform, it's the connective infrastructure helping us scale our impact and turn engagement into a sustainable ecosystem for community care."
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 moreFrom operational chaos to calm control — 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 tool · no signup
Vendor application form generator
Build a printable, branded vendor application in 60 seconds. Pick your fields, download a PDF, or embed it on your event site. Free forever — no account needed.
Plus a booth fee calculator and approval email templates — all free, no signup.
- 16 pre-built fields organizers actually use
- Download as a printable PDF
- Copy an embed snippet for your site
- Built from the playbook real festivals use
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
Why not just spreadsheets or a ticketing tool?
Ticketing platforms stop at "tickets sold." Spreadsheets and inboxes can't run a live event week. EventOS is the operational layer in between.
Spreadsheets + inbox
- ·Vendor info scattered across tabs and threads
- ·No automatic confirmation or decision emails
- ·Hand-counting attendees at the gate
- ·Updates lost in reply-all chaos
Ticketing platforms
- ·Great at selling tickets — then it stops
- ·No vendor, sponsor or volunteer workflows
- ·No event-week operations or task ownership
- ·Per-ticket fees that scale against you
EventOS
- Registrations, vendors, sponsors, volunteers in one place
- Automatic branded confirmations & decision emails
- QR check-in with a live attendance count
- Announcements, deadlines & ownership for the whole crew
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, registrations and Event Hubs 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 hubs 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