Not sure about the iOS issue so far... god knows how to fix compatibility with it, different browsers won't work because you can't adjust the cross-site limits thingamajiggs. The only tips I can offer (if they're tips at all) is stay at home and at the desktop (rip if you're schooling), have a laptop handy with you at all times, or you'll have to miss the event. Or use android devices, those generally don't suffer from the same compatibility bs as iOS does.
Edit: I forgot to mention you can try clearing website history and cookies in settings, but that hasn't worked out for me so far. Make sure you don't have too many important tabs on, clearing history also wipes all tabs from safari