Sounds like you're heading to a really big party! FUN! The only problem with making a double batch is that you want the layers to be fairly thin (as discussed above), so nobody dips a cracker partway into your appetizer and only scoops up one layer – maybe only a big bite of pesto. The goal is that every scoop will include a little of each layer, all together in one scrumptious bite. So, to double this recipe effectively, you'd need a big, BIG platter. A better idea: Make two batches, on two different platters, and bring the fresh, second platter out once the first one gets gobbled up.