Absolutely. You can either get the sandwich fixings separately and lay them out on trays (sliced turkey, roast beef, cheese, vegetables) and have a basket with sliced breads and rolls. Then have a selection of mayonaise and mustard with spreading knives.
You might want bring one of those large sized “blue ice” squares to set under the cold food tray if the food will be out of the fridge for awhile. You can also go to the grocery store deli and have them make several of those huge sandwiches which they will slice for you. Then have another tray that has sliced fresh veggies (carrots, broccoli, celery and maybe some olives) with a bowl of dip. Have several bowls of potato chips, tortilla chips and mixed nuts. And a big plate full of cookies. Costco is a really good place to get all of this stuff. And if you need plastic bowls, plates and serving platters go to Smart and Final. Then have a cooler with ice filled with bottled water, regular and diet soda, iced tea and juice boxes if there will be any little kids.
Another thing you can add is a crock pot filled with chili or stew or soup. You can get disposable bowls at Smart and Final. Similar to these
You can also have a big bowl of fruit (apples, oranges, bananas) for people to grab.
Make sure to have plenty of paper plates, napkins and plastic utensils. And several bag lined trashcans (and a recycling bin) put in convenient areas. And don’t forget to get extra toilet paper for the bathroom.