Thanksgiving 2026 parade: 2000 people over 4 hours. How many units?

I'm coordinating the portable restroom plan for our city's Thanksgiving 2026 parade. We expect around 2000 attendees over a 4-hour timeframe, with families and multiple food vendors along the route. The parade runs on paved streets, so truck access is good for delivery and service. I'm thinking we'll need a mix of standard units and ADA-compliant ones, but I'm unsure about the total count and how many ADA units to include. Should we consider any deluxe units or a restroom trailer for the vendor area? What's the right breakdown for this type of event?