Backyard party with 80 people: How many porta potties for 5 hours?

For 80 guests at a five-hour evening party with alcohol, you need at least three portable toilets to avoid long lines. That includes one ADA-compliant portable toilet and two standard units. The event planning guideline suggests one unit per 50 to 75 people for a four-hour event, but alcohol consumption increases usage, and five hours is pushing beyond a short gathering. A deluxe unit with a sink and mirror is a good upgrade for guest comfort, replacing one standard unit if your budget allows. You definitely need a handwash station with soap and water, especially with a buffet, to meet basic hygiene. Since it's a one-day event, weekly service isn't needed, but the rental company will service the units after pickup. Your gravel driveway and flat lawn are ideal for placement and truck access. Cluster them together on level ground, not too far from the party but downwind if possible.