But there is Grad Bash April 22nd and 23rd.
There is a special senior thing where they can visit the city walk clubs from 5pm to 8pm. Why seniors would want to visit a club that early is beyond me, so I don't think many will do it. The event itself is from 7pm to 2am and I don't even think IOA will be open to outside people at that time.
If it were me, I wouldn't be any where near the parks at say 4pm, when everyone shows up. I'd get out of there and go somewhere else