It’s not yet March, but Month of Photography shows are ramping up in galleries ranging from co-ops to the Denver Art Museum, with artist talks and demonstrations shedding light on why and how art is made. But the biggest opening this weekend is the sixth annual Casa Bonita Art Show, returning in triumph as the wacky pink eatertainment palace prepares to reopen in May. The show is already exceeding expectations, with more than seventy artists on board…