Hot dogs are a common food choice when having a large party or gathering. They are already cooked when you purchase them, so they really only require heating before serving. The buns also require heating, as a warm bun helps make it complete. Depending on the type and location of the gathering, you have a few choices on how to heat up hot dog buns for a big crowd.
The grill adds a smokiness and charred taste to hot dogs that can't be matched by any other method, and you can also use it to heat up the buns. For crispier buns, open them and line them up for several seconds right on the grates of the grill. For softer buns, wrap them in foil and place them on the upper shelf of the grill and close the lid for a couple of minutes. Heat the buns after you've grilled a bunch of wieners and both will be hot when you serve them.
If the party is indoors, your microwave makes an effective vehicle for heating large numbers of hot dog buns. Wrap several buns in paper towels and microwave on high for about 15 seconds, just before you are ready to serve the hot dogs. Microwaving the buns will leave them soft and warm like they were fresh baked. Do not wrap the buns in foils like with the barbecue, or sparks will be flying around inside the microwave and you'll risk starting a fire.
Another indoor option for heating up large numbers of hot dog buns is steaming on the stovetop. To steam the buns, all you need is a pot or pan and a rack to set over the top to support the buns. Steaming baskets work, as do specialized steaming pots that come with a steaming basket and lid. Just add an inch or so of water to the bottom pot or pan and then place the buns in the basket or on the rack and turn the heat to high. Once the water begins to simmer, the steam rises and the buns will heat up and soften. Leave them in there only for a minute or so, or they will get soggy.
If all else fails, your oven makes an effective vehicle for heating large numbers of buns. Stack them on large baking sheets, or wrap them in foil and heat the oven to 350 degrees Fahrenheit. Stacking them on a sheet will create toasty buns all over, and wrapping them should keep the buns relatively soft. Check on them after a couple of minutes to see if they are warm enough for your liking.