Sandwiches
Since you have only a week or so, may I strongly suggest you get with one of the good sub shops and order your sandwiches in assorted trays- they can advise to what is the preferred assortment in your area.
If you choose to set out choices, please use the guide for cold cuts and cheeses, breads and condiments on the sandwich page. For example, 1/3 roast beef, 1/4 ham, 1/4 turkey, and 1/6 tuna or egg salad would be a much more usual assortment. Have a 2 sided serving table- one line will be too slow.With the kids coming, a bowl of smooth peanut butter or Nutella and some jam, also.

macaroni salad, 6 pounds dry pasta, many recipes for 100 this site
Caesar salad, use the amounts for 100 on the plan for 100 page
coleslaw 2 1/2 gallons

veggie platter, with all the salads, strongly suggest you consider fruit trays instead. See fruit tray page
pickles and olives, about 3 quarts each, assorted
deviled eggs, good, very popular, 4 1/2 dozen eggs. Notes on procedure and timing on this are on this site.

cheese, 1 pound per 12, some can be logs or spreads
crackers, 6-8 pounds

Suggest you have lemonade or punch, about 8 gallons, about 10 iced tea (3 unsweetened) and dinner level coffee from the beverage page. Advice about water, ice, plates, napkins, etc, is also on that page.

Please consider recruiting or hiring a half dozen or 8 people to set up, serve and clean up the party, who are not in the wedding. That's what it takes to have a relaxing, trouble-free meal for 100.