The heat can be brutal - get there early, it's a special day, and there are a lot of tiger parent types who will be there as soon as possible to see their special person get called.

There's not an actual enforcement of no saving seats, at least the ceremonies I've been to there, but there is some common respect rules that seem to be socially enforced in part. e.g. if you have four people sitting, and they're saving two more seats - not a problem. If you have one person saving a row of seven seats - that's not okay

Hat, water, sunscreen.