Proctors MainStage will be the rehearsal space for three consecutive shows this fall due to the Empire State Music and Theatrical Production Tax Credit   SCHENECTADY – Proctors Collaborative Chief of Staff Jean Leonard joins state legislators John T. McDonald, Patricia Fahy, Angelo Santabarbara and Phil Steck, along with Schenectady Mayor Gary McCarthy today in announcing the return of teching Broadway shows to Proctors. Three shows will assemble and rehearse at the…