Sposable — Stress-test an idea before committing
https://sposable.com/labs/stress-test-an-idea/

The initial plan exceeds room capacity by four and food alone costs €160, €40 over budget. A defensible revision is a bring-your-own-lunch exchange capped at 12, subject to room availability and at least eight expressions of interest. Do not announce a confirmed event yet. Alternative: collect interest first and choose another date if the room is unavailable. Pause if fewer than eight members are interested. These are conditional proposals, not approvals; no exact revised cost is known.