WordNet sense 1 (a collection containing a variety of sorts of things):

assortment, miscellanea, miscellany, motley, potpourri, smorgasbord, variety, salmagundi, mixed bag

WordNet sense 2 (any foodstuff made by combining different ingredients):

concoction, intermixture

WordNet sense 3 (an event that combines things in a mixture):

mix

WordNet sense 4 (the act of mixing together):

admixture, commixture, mixing