Use the facility reservation as the starting document
The county facility-rental resource helps identify managed spaces. Check the particular venue, the reserved area and the times when your group may enter. A reservation for a room or pavilion should not be assumed to include adjacent land or permission for temporary restroom equipment.
Ask what the venue already provides
Determine which restrooms guests may use and whether they remain open through setup and close-down. If extra facilities are appropriate, ask where they could be placed and how supplier vehicles would reach that position. Include an accessible pedestrian approach in the discussion.
Request a route review before relying on a rental
Provide the full address, equipment preference, expected use and delivery windows. We need to discuss the wider route and available equipment rather than infer service from this directory listing.
Keep the venue booking and the rental agreement separate. Both need confirmation, and a change in either schedule may affect the other.
Official planning resource
St. Johns County facility information can help identify the relevant operator. Check current conditions with that operator; this link does not imply a partnership or permission to install equipment.