In California we have many Mexican restaurants / grocery stores, and the bigger ones include tortilla factories on premises. There are two within ten minutes of my house. Tortillas are sold in bags of fifty, often still warm, and it's a common sight while waiting in line to see a Mexican leave with two to four bags.
My next door neighbor (the master woodworker) throws parties this way. For his birthday some years back his family bought him an outdoor griddle, a cart with a propane tank, about the size of a typical gas grill, with instead a restaurant-style griddle on top. I hid this for them till his birthday, and borrowed it back to serve tacos for 50 at a wedding rehearsal dinner. (I made pork butt in the KK, and Rancho Gordo beans, and bought the tortillas, guacamole, chips, and salsas.)
French fries are twice cooked. So are commercial tortillas. They are usable as sold warm in the bag, but everyone always heats them on a griddle for serving. Think "buy sliced bread, make toast."
Our tortillas from homemade masa can be more substantial, but the same principles could apply.
What one might overlook if one has never seen this: Commercial tortillas are grilled, and often served, in pairs. This of course wouldn't work for the first cook, which for us is usually the only cook, but it works for the second. This has the effect of grilling one surface of each tortilla while the inside surfaces of the pair steam each other. One flips the pair. One could reverse the pair to grill all surfaces or leave this alone, a matter of taste. For a party, the point here is one can do twice as many tortillas at once, grilling in pairs.
For thin commercial tortillas, it is usually the case that one builds a taco leaving the pair alone. Why is a subject of debate, and it's largely custom, I'm not sure one can believe any single answer. One theory is that individual tortillas are fragile, but both tortillas in a pair are unlikely to split in the same location. A different theory is that one can then separate the two tortillas to make two tacos from one. I've tried this and they don't always separate that easily, suggesting a competing theory that the pair is to provide more food, and the vendor doesn't want to try separating them either.
For us, if they're cooked sufficiently on pass one, they'll grill just fine in pairs and separate easily for serving. I press mine thick enough that one wouldn't want to use pairs to make tacos.
So this is what I'd do for your party. You don't even really need a practice run if there isn't time; good judgment should keep you out of trouble, first try.