(n.) One who, or that which, mixes.

ARRL agitator amateur radio operator bal bal costume bal masque ball barn dance beater blender bon vivant cement mixer churn clubman clubwoman console control desk control engineer control panel country dance crucible dance eggbeater emulsifier excellent companion fancy-dress ball good company good mixer ham hop jack field joiner man-about-town mask masked ball masque masquerade masquerade ball master control desk melting pot monitor nightclub habitue playboy pleasant company prom promenade radio electrician radio engineer radio operator radio technician radioman radiotelegrapher radiotrician record hop shindig shindy social lion square dance stag dance tea dance the dansant