Prepare yourself for sleighing belles, rabid yells, and tidings of joy from New York’s most iconic “nonagenarian” lounge act, Kiki (Justin Vivian Bond) and Herb (Kenny Mellman). A match made in — depending on who you ask — a 1934 Western Pennsylvania children’s asylum, the ’90s San Francisco club circuit, or the dawn of time, this relentlessly fabulous duo makes its BAM debut with a brand-new holiday spectacular.