The 92nd Street Y Harkness Dance Center’s 2021-22 Mainstage Series continues on Thursday, December 16 with Michelle Dorrance, Dormeshia & Guests. It’s billed as an evening of tap but that understated description is unlikely to adequately cover what’s in store. In addition to solo turns by the headliners, Dormeshia and Michelle will also "pass the mic" to tap dance soloists of the next generat…