Thanks everyone......think I will just wrap individually in foil after I take out of oven. I have one of those 9x13 pyrex carriers......maybe that will keep them warmer. There is a microwave in room but not sure they will be able to get to it because of all the crock pots, trays of goodies, etc.
I just googled ham/swiss cheese sliders and use one of those recipes. I think the one I usually use has dijon mustard and mayo. I go light on the poppy seeds.
I did see the Sara Lee rolls....I'll have to try them sometime.