Dinner theaters aren't called on to worship at the altar of art, but rather to satisfy down-home audiences looking for anxiety-free entertainment: families, young couples, church groups, business groups, people celebrating birthdays and anniversaries. But Boulder's Dinner Theatre nimbly accomplishes the two-step between commercialism and creativity, mounting summer productions filled with adorable kids; old chestnuts that reliably fill the house; smaller, quirkier shows; and the occasional sexy sizzler. This year, the roster was Annie, Singin' in the Rain, The 25th Annual Putnam County Spelling Bee and Chicago, and BDT produced them all with style. Every show featured fine singing, energetic and sometimes inspired acting, well-conceived sets and costumes, the music of Neil Dunfee's talented small orchestra, and the cast's infectious exuberance. There's a lot to be said for pure enjoyment — and this BDT season said it all.