Somerville will host its second annual LGBT Skate Night next weekend along with a costume contest for Halloween. Skaters will hit the ice at the Veteran’s Memorial Skating Rink at 570 Somerville Ave. on Saturday from 8 to 10 p.m., and prizes will be awarded for the best costumes. Tickets are $10. The event is being sponsored by the Lesbian, Gay, Bisexual, and Transgender liaison to the city’s Office of Somerville Commissions in partnership with Shape Up Somerville and the Somerville Council on Aging. For more information, contact the city’s LGBT liaison, Elizabeth Field, at 617-625-6600, ext. 2400.