Cut the tops off the pointed end of the garlic bulbs. Put them onto a sheet of aluminum foil and drizzle with 1 tablespoon of the olive oil. Wrap loosely, put into the oven and bake until soft, 35 to 45 minutes. Unwrap and let cool a bit.
Melt the butter in a medium skillet over medium heat. Add the sliced red onions and cook slowly, stirring often, until the onions are dark and caramelized.
Heat a grill or grill pan over medium heat and add the jalapeno peppers, corn and bell peppers. Turn the vegetables frequently until they are well charred. Put all the peppers into a bowl and cover with plastic wrap. When they are cool enough to handle, peel off the black skin and chop into small pieces. When the corn is cool enough to handle, cut the kernels off the cob.
Cut the tortillas into triangles and put them in one layer on 3 baking sheets. Drizzle 1 tablespoon of the olive oil over each pan. Sprinkle the spices, one for each pan, over the triangles. Bake until they are lightly browned and crispy.
Peel and chop the mango. Stir in the chopped red onions, half the lime juice and some salt.
Peel and chop the avocado. Add the rest of the lime juice and some salt and mix gently.
Set up your Guacamole Bar: Put the guacamole in a large bowl. Put all the mix-ins - the roasted garlic, mango salsa, caramelized onions, bell peppers, corn, jalapenos, cilantro, scallions, chipotles, red pepper flakes and hot sauce - into smaller bowls. Let people help themselves to guacamole and their favorite toppings. Serve with the flavored chips.