In regular dance groups often the dancers have their favorite group of partners, (hopefully at least three!) among whom they choose. Sure, there are always the neighbors whom they meet along the line - but there are also the folks who are new and/or shy and/or never chosen for partners and/or - you name it. Mixers tend to give a sequence of 32 bars - and one's attention to someone hitherto undiscovered. They are good community builders. And there is a great variety of them... Hanny, who uses mixers in all her programs, but usually only one, and early in the even ing