This is the first sit-down dinner wedding I will be attending. The wedding ceremony starts shortly after noon directed followed by the cocktail hour and reception.
The weddings I have attended have been buffet style, and not too formal ( Able to move around and mingle with guests freely, no fixed seating plan, etc.)
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Basically you sit at a round table with about 10 people. Food is usually brought out "family style"
A plate of chicken, beef & sausage (or whatever) along with the vegetables & potatoes.
You just pass the plates around. A server will ask if your table needs more "X" if one person said yes they'll bring another plate. If you want some more to eat you ask someone to pass the "X"
It's actually pretty informal.
The rest is probably the same. You tap on your glass for the bride & groom to kiss etc.
After dinner you dance & whatever. When your tired you usually go back & sit at your table.
OH, I should add that when you go in there's probably prearranged seating. You look for your name & table number.0