Guides & Tutorials
Prismm Is Retiring: Move Your Venue Floor Plans by June 2027
Prismm (formerly AllSeated) is moving into Cvent Event Diagramming. Key dates, what does not carry over, what to export now, and where to rebuild your rooms.
Prismm, the floor plan tool many venues still know as AllSeated, is being retired. Cvent bought it in 2025 and is folding it into Cvent Event Diagramming. You can still edit your Prismm events until June 2027. After that they are view-only.
If your rooms, layouts and capacities live in Prismm, you have until June 2027 to save them. This guide covers the dates, what does not carry over, what to export now, and your two options: stay with Cvent, or rebuild the rooms somewhere else.
The short version. Export every room you use as a PDF before June 2027, while you can still open and edit it. Your Prismm templates will not move to Cvent, so write down each room's standard layouts too. The dates below come from Cvent's Event Diagramming migration page, read on 26 September 2026.
What is changing, and when
December 2024
AllSeated rebrands as Prismm.
April 2025
Cvent acquires Prismm. More than 5,500 venues, hotels, planners and vendors use it at the time.
13 May 2026
Prismm workspaces start moving to Cvent Event Diagramming, the product formerly called Social Tables.
26 August 2026
New events can only be created in Cvent Event Diagramming.
June 2027
Prismm access ends. Until then you can still edit existing Prismm events. After it, your Prismm work stays in Cvent as view-only.
The acquisition is on the record in Cvent's April 2025 press release. Cvent Event Diagramming is the product that used to be called Social Tables. If you paid for Prismm, Cvent says you keep your plan and your price unless you choose a new Cvent plan.
What does not carry over
Your events move. Several things around them do not. Per Cvent's migration page:
- Templates, favourites and groups stay behind. Cvent tells you to recreate templates as Saved Layouts in Cvent Event Diagramming.
- Only events dated 1 January 2022 or later appear in Cvent. Anything older is only in Prismm, and only until June 2027.
- Tabletop Designer is not in Cvent Event Diagramming yet. If you rely on it, plan for a gap.
For a venue, templates are the expensive loss. A template is a room drawn to scale with its standard setups: the ballroom as banquet rounds, as theatre, as classroom. Rebuilding them is work you want to do once, deliberately, not in the week a booking needs one.
Do this now: a checklist for every room
Cvent itself tells users to export the floor plans and reports they want to keep before the sunset. Work through this list room by room.
- Export each room's floor plan as a PDF. Do it while you can still open and edit the event, so you can fix anything before you export. One clean PDF per room and per standard layout.
- Export the reports you rely on. Guest lists, table lists and anything your team prints for setup.
- Record each room's dimensions and capacities. Length, width, ceiling height if it matters, and your certified capacity for each setup. A spreadsheet row per room is enough.
- List your standard layouts per room. For example: Grand Ballroom, banquet rounds of 10, 30 tables, dance floor centre; theatre, 420 chairs, centre aisle. These are your templates, and they will not transfer.
- Pull anything dated before 2022. Those events will not appear in Cvent at all.
- Pick where the rooms will live next. Then rebuild your busiest room first and test it on a real booking before June 2027.
Not sure what each setup should hold? Our guide to event seating styles and capacities gives space-per-guest rules of thumb for banquet, theatre, classroom, cabaret and more.
Your options
Option 1: stay on Cvent Event Diagramming
This is the path of least change. Your events from 2022 onwards move across for you, and you keep working with the same company. If you pay for Prismm today, you keep your plan and price unless you pick a new Cvent plan. If you run a handful of events a year, the free plan may be enough.
The costs to check are the published ones. On Cvent's pricing page (checked 26 September 2026) the free plan is fixed at 3 events and 1 user. Venue plans are $150 a month for Pro and $320 a month for Premium, and every paid plan has a 12-month commitment. You will also rebuild your templates as Saved Layouts either way.
Option 2: rebuild your rooms somewhere else
Since you are recreating templates regardless, it is a fair moment to ask what you need. Many venues need three things: each room drawn to scale, a reusable setup per style, and a way to show planners the room. That is what SeatPlan is built around, and the first part is free.
How to rebuild a room in SeatPlan
1. Put the room on seatplan.io for free
Start with the free venue floor plan software. Enter the room's width and depth in metres or feet, or upload the floor plan you already have, and lay out the room. Then fill in two short screens: where the venue is and what the room holds. There is no account to create and nothing to pay.
We review every room by hand and email you its own page on seatplan.io, showing the room to scale with its seated capacity. A private link in your confirmation email lets you edit the room later. If you like, add the small View on seatplan.io button next to the room's photos on your website. The button is optional and always carries our name. Planners who click it see the room and can start their seating plan in it.
2. Import the PDF you just exported
The PDFs from your checklist are the fastest way in. AI floor plan import reads a PDF, a photo or a screenshot and places the tables and areas it finds on a canvas you can edit. PDFs need to be a single page of up to 4.5 MB. You can try it free with no account. Treat the result as a head start: check the table count, seats and room size against your records before you use it.
If you have the architect's CAD drawing, upload the DXF instead. The free venue flow imports its walls and columns at exact scale, with no account and no AI. You then add the tables. Our AI floor plan import guide covers formats and limits.
3. Save each setup as a template with Event Manager
Event Manager is for the team that runs the bookings. Draw the room once and use Save as Template for each setup: banquet, theatre, classroom. For a new booking, open the template and choose New event. The layout is copied and the template stays untouched. Send the client a share link so they seat their own guests while the tables you lock stay put, and export a PDF floor plan for the setup crew.
Event Manager costs $40 a month or $420 a year. There is no limit on events or templates, and it includes 10 AI floor plan imports a month. The price is published and you check out yourself, with no sales call. You can cancel at any time to stop future charges, and cancellation takes effect at the end of the billing period. The monthly plan has no long-term commitment.
Comparing tools side by side? See SeatPlan vs Prismm.
