The plaza of the Longmont Public Library will come to life during Downtown Longmont’s annual holiday lighting on Saturday. From 6 to 7 p.m., guests can enjoy warm drinks, sweets, take-home crafts and time with Santa in the Library West Plaza, 350 Kimbark St. Attendees will help count down the plaza lighting around 6:30. This year’s there is “Merry-achi Holidays,” with music performances by the band Las Dahlias.