Planning a big BBQ for about 100 people next year for our office team, just planning ahead

Thinking of best dishes that are relatively easy to either prepare in advance or cook in large quantities. Tools available will be smoker, sous vide, 120cm spit, electric oven, large charcoal BBQ grill.
Planning to do this with 3 assistants, we're not professional but do a lot of cooking & BBQ. Goal is to minimize effort on BBQ day...
My current plan includes
- lamb gyros spit roast, this is pre-prepared by butcher and spit roast on the day
- grilled chicken skewers, marinated day before and grilled on the day (although not sure if this is overambitious for amount of people)
- pulled pork, pre-prepared before and just reheated at BBQ time
- beef dish maybe, not sure what
- bread : slider rolls & pita bread
- salads: potato salad, rice salad, green salad, tomato feta salad