Thanksgiving 2026 dinner for 100: porta potties for outdoor seating?

We're hosting Thanksgiving dinner for 100 people next year, and I'm planning ahead for restrooms since half the seating will be outdoors on our lawn. The ground is flat grass, and a truck can pull right up to the edge of the property. Dinner will run about 4 hours with alcohol served. I'm trying to decide between a few standard units or something nicer like a deluxe flushing unit or even a small restroom trailer. What do you think works best for a holiday meal where guests are dressed up? Should I worry about adding an ADA-compliant unit even if we don't have anyone in a wheelchair coming?