This is very good and easy to make. You mentioned they may have a frig so you can keep them there until time to serve. I've even taken these to a picnic so they hold up well and don't need to be put on ice when serving as long as it's not too warm there. Or you can put them out in batches but I think they will be fine.
RANCH HAM ROLL-UPS
2 8-ounce packages cream cheese, softened
1 envelope ranch salad dressing mix
3 green onions, chopped (I diced)
11 8-inch flour tortillas
22 thin slices deli ham
In a small mixing bowl, beat cream cheese and salad dressing mix until smooth. Add onions, mix well.
Spread about 3 tablespoons over each tortilla. Then lay 2 slices of ham on top.
Roll up tightly and wrap in plastic wrap. Refrigerate until firm.
Unwrap and cut into 3/4-inch slices.
Yield: 7 1/2 dozen
Note: I also added a cup of grated cheddar cheese to the cream cheese and dressing mix.
This was posted by acidcookGA way back in may of 2003 and says this was from the Dec/Jan 2003 TOH. I have made it serveral times and it is good.