BAD IDEA
Can I run away during an event because I really need to pee and can't stop?
Yes, if you want everyone to remember you as 'that person' who bolted mid-event for a bathroom break.
Sure, you can run off mid-event because nature calls, but don't act like it's some rare medical emergency unless you enjoy awkward stares and possibly missing whatever happens next. Just know you’re risking your reputation for a quick relief sprint. Prioritize your bladder, but maybe plot your escape more discreetly next time.