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There are two types of public radio listeners: those who enjoy hearing Garrison Keillor make slowly spoken jokes about Lutherans and Twitter and those who’d rather jump into Lake Wobegon. For the former, A Prairie Home Companion will kick off its summer tour at Wolf Trap this Friday and Saturday. Now that its episodes are available online and Lindsay Lohan starred in a movie about it, there may be several generations of fans converging on Wolf Trap’s lawn with PBS totebags stuffed with Camembert —only lawn seats remain, so good luck avoiding the clacking of plastic glasses of Chardonnay. Saturday afternoon’s performance has the added bonus of being broadcast live so you can enjoy the antics of “Guy Noir, Private Eye” along with listeners at home. A PRAIRE HOME COMPANION PERFORMS FRIDAY AND SATURDAY AT WOLF TRAP’S FILENE CENTER, 1551 TRAP ROAD, VIENNA. $22-48. (703) 255-1860.