Once again, I've updated the spreadsheet.
PLEASE CHECK IT!!!(btw, we're keeping administrative permissions, so all you can do is view and PM me if there is a problem)
Stats:
178 guests bringing
4 Appetizers
11 Beverages
1 bread
1 condiment
9 desserts
12 Main
6 Sides
1 supply (cooler)
2 need grill, 4 bringing grill
4 for setup, 3 for cleanup
Suggestions, especially for those of you who would rather shop than cook: standard grill condiments, salt, pepper etc. (please keep the ketchup uproar to a minimum

) Breads of various types (SWB, baguettes) coolers filled with ice to chill drinks, coolers filled with ice to serve in drinks.
Also, those of you who are campers - screen tents/portable canopies, large beach umbrellas, etc might be a good thing to pack to hedge our bets - there is a picnic shelter, I'm coming rain or shine - but there are an awful lot of people; extra shelter is a good thing for multiple reasons.
Entertainment is also a good thing to bring - portable games, musical instruments, whatever as long as it's family-friendly and you're responsible for it - speaking for myself, I'd be happy to consider singing for your supper a contribution.