WordNet sense 1 (a commercially prepared mixture of dry ingredients):

premix

WordNet sense 2 (an event that combines things in a mixture):

mixture

WordNet sense 3 (open (a place) to members of all races and ethnic groups):

desegregate, integrate

WordNet sense 4 (to bring or combine together or with something else):

amalgamate, mingle, unify, commix

WordNet sense 5 (mix so as to make a random order or arrangement):

ruffle, shuffle

WordNet sense 6 (mix together different elements):

blend, coalesce, combine, commingle, conflate, flux, fuse, meld, merge, immix, combine

WordNet sense 7 (the act of mixing together):

admixture, commixture, intermixture, mixing

WordNet sense 8 (add as an additional element or part):

mix in