Waterfront birthday party - how do I handle bathroom logistics for 50 guests?

We rented a house near the water in West Palm for a birthday party next month. The house is great, but it only has one bathroom, and we’re expecting around 50 people. I’m worried about long lines and guests having to wait. For anyone who’s hosted a party in a rental home, is it common to use a portable bathroom? Are there usually restrictions from the rental company? Any tips would be helpful.