What's the most common mistake new event planners make with porta potties?

Under-ordering for alcohol and food is the mistake I see most, right after skipping an ADA unit.

When I planned our backyard wedding, the first quote came back with barely enough standard stalls for the guest count and no accessible unit. Guests with drinks use the restrooms a lot more than a sober daytime picnic, so the lines build by the second hour if you stock like a dry lunch. The 2010 ADA Standards expect an accessible portable toilet when you provide units for a public event, and the cluster rule means you cannot stick the ADA unit off by itself away from the rest of the bank.

Placement is the other trap. Soft grass looks fine until the vacuum truck sinks or cannot get hose reach on day two. Level firm ground with clear truck access saves that headache. For service frequency on a multi-day event with food vendors, ask for a mid-event service visit instead of drop-and-hope. New planners also forget handwash near food lines. Sanitizer helps, but soap and water next to the units cuts the mess guests leave inside.