Chevalier Theatre welcomes living comedy legend and “Monty Python” cofounder for an evening of live conversation and audience Q&A (absurd and/or ridiculous questions only are requested, please). John, now 84, will tell stories of his life and career and you just may finally find out the air-speed of an unladen swallow. Before John silly-walks his way on to the Chevalier stage, the excitement will build as the audience will get to watch “Monty Python and the Holy Grail” in its entirety on the big screen. Tickets are $49 to $179 through the Chevalier Theatre website/Ticketmaster. To avoid online ordering fees, purchase tickets at the Chevalier Theatre Box Office, which is open on Fridays and Saturdays from noon to 6 p.m., as well as two hours before every Chevalier Theatre show.