“Monty Python’s Spamalot”: Amarillo Little Theatre closes out its season with this uproarious musical, based on cult-classic comedy “Monty Python and the Holy Grail.” Don’t miss Brick & Elm co-founder Jason Boyett as one of the knights. (7:30 p.m. Thursday; continues through May 19; Allen Shankles MainStage, 2019 Civic Circle; ticket prices vary; 806-355-9991)