Estimate portable units, ADA-accessible counts, and handwash stations from attendance, duration, and alcohol service. The accessible math follows the 2010 ADA Standards; the sizing table is honest about being a rule of thumb.
The base table assumes a 4-hour event; longer events scale up to 2x at 10+ hours.
No adjustment.
MODELED (rule of thumb): add 20 percent of units when alcohol is served.
From the XPMS compliance engine: the same rulebase that runs XMCE checks in LEG3ND. What is XPMS? Explore LEG3ND
Permanent venues size restrooms from the plumbing code: IPC 403.1 sets minimum fixture counts per occupant by occupancy type. Outdoor and temporary events do not get a single national table, so the industry converged on a sizing practice keyed to attendance, event length, and alcohol service, and your local health department turns that into a permit condition.
Accessibility is the part with hard numbers: the 2010 ADA Standards section 213 requires at least 5 percent of units to be accessible, with a minimum of 1, and the practical reading for events is at least 1 accessible unit in every cluster so nobody crosses the site to find one. Place them on firm, level routes and keep the doors clear of cable ramps.
Service rounds, cluster checks, and vendor punch lists in the field app your ops crew carries.