Weaned on a combination of Broadway musicals, Lawrence Welk, and classic rock, director- choreographer Ken Roht spent several years globe-hopping with the Young Americans (alongside Desperate Housewives creator Mark Cherry) before moving on to work with Iranian theater provocateur Reza Abdoh. Over the past four years, his annual 99-cent-store extravaganza has had broad appeal and a Through the Looking-Glass perversion. This year’s installation, “Route 99”: Orange Star Dinner Show — the most chaotic and convoluted yet — takes place in a Wyoming dinner theater run by a stage mom who always dreamed of spawning the ultimate girl group (à la the Andrews Sisters) and raised her children as such — despite two of them being boys. The lead, like the one in Sondheim’s musical Gypsy, is simply known here as Mama, and the other 25 cast members host a sit-down dinner for 40 audience members, onstage, amid bar brawls and Fosse-like dance numbers. Roht — whose fans include the fawning Michael Silverblatt (host of KCRW’s Bookworm) and the Skirball Foundation, which honored him with its Audrey Skirball-Kenis TIME award — collaborates here with songwriter John Ballinger and costumer Ann Closs-Farley (see article), as well as a motley cast of capable talents that includes actor Don Oscar Smith and actress/choreographer Sissy Boyd.