In a recent phone interview, humorist Garrison Keillor gave us just a few hints about his upcoming appearance in Tampa. "It will be a show including one man, a microphone and a stool, and I don't actually sit down very much,'' he said. Keillor, well-known for hosting Minnesota Public Radio's Prairie Home Companion,'' is also the author of more than 10 books including his newest, O, What a Luxury: Verses Lyrical, Vulgar, Pathetic & Profound, a book of poems released in October. "Yes, I do expect to recite a bit of poetry on my visit,'' he said. "And I have quite a bit to say about cheerfulness too, which I think is the obligation of an older person.'' An Evening With Garrison Keillor is 7:30 p.m. Sunday at David A. Straz Jr. Center for the Performing Arts, 1010 N MacInnes Place, Tampa. $35.50-$55.50. (813) 229-7827. strazcenter.org.