There is limited research on this specific topic. However, studies on public urination and portable toilet usage provide some insights:
This academic piece analyzes how "gender-critical" arguments often prioritize de-legitimizing certain identities over a thorough discussion of how to improve toilets for all women, including those who experience queerphobia. ResearchGate Key Issues Discussed lesbian piss in public portable
: Portable toilets are usually placed in easily accessible locations. Look for signs or ask event staff/site managers for directions. There is limited research on this specific topic