October 2026 charity gala: 400 guests, black-tie, heavy champagne service. How many restroom trailers?

For 400 guests at a five-hour black-tie gala with heavy champagne service, order two restroom trailers. Each restroom trailer typically contains 4 to 6 flushing toilet stalls, and the industry guideline for events with alcohol and longer duration is to provide more units than the baseline one per 50 to 75 people for a four-hour event. Two trailers will ensure minimal wait times and meet the premium experience expectation.

Restroom trailers include ADA-compliant stalls, so you do not need to add separate ADA-compliant units. The ADA cluster rule requires at least one accessible unit per cluster, which is satisfied by the trailer's built-in accessible stall. Deluxe units are unnecessary since trailers offer flushing toilets, running water, and amenities like mirrors and sinks.

Place the trailers on level ground with truck access within 25 feet for servicing. For a one-day event, service before and after is standard; heavy use may require mid-event pumping if the holding tank capacity is exceeded. Cost drivers include the trailer type, rental duration, service frequency, and any add-ons like extra handwash stations or lighting.