You know when it begins. And I bet you know whether you tend to arrive to things too early or late. Use your best judgement. We probably won't notice you until the reception anyways.
Honestly, as it says on the other page: clothes. Save the nudity for the reception and be comfortable. The people involved will be dressed very nice & will look damn good. Try not to compete.
If your invitation says "guest" or "family" then we expect a rando or little ones, and that chaos is on us. Otherwise the chaos and awkward starving "friend" is on you.
HA. Good Luck.
Who do you think you are...?