"If you think we're nervous, you're right," laughed 81/2 Souvenirs guitarist Olivier Giraud, shown with singer Chrysta Bell, during the exotic swing sextet's first show in more than four years at the Cactus Cafe Monday night. Giraud's father flew all the way from France to be part of the packed house that saw the Souvenirs revisit their old-world repertoire, including "Happy Feet," "Black Trombone," "L'Amour Toujours," and Serge Gainsbourg's "Comic Strip." "I forgot how much fun this was," Bell said. So did we. The group continues their reunion minitour at Antone's tonight (Thursday) and the Continental Club Friday; unlike the Cactus, there should be plenty of room on the dance floor at both.