We have large family gatherings (think 12 siblings and their spouses and kids, of which DH and I are kids) for reunion and Christmas.
For lunch you could set out a sandwich bar. A couple types of bread, two lunch meat options, two cheeses, a cold salad option (tuna, chicken or egg), fixings, and a panini press. Oh, and pb&j for kiddos.
Pairs well with a veggie/fruit tray, cookies/chips, etc.
My grandma also does these awesome Hawaiian BBQ pork spare ribs in a big pot. Served with small rolls to make sandwiches
Apparently we like sandwiches.