THE MIDDLE - "The Wedding" - Frankie and Mike are surprised to receive an invitation to Mike's brother Rusty's (Norm Macdonald) fast approaching wedding. But their surprise turns to panic when they discover that he has listed the Heck house as the site of the ceremony. Meanwhile, Axl and his friends decide to become their own bosses and set out to form their own company to garner summer jobs, and Brick is upset with Mike when he finally accepts an invitation to a fellow student's party but is not allowed to go because it falls on the same day as the wedding, on the Season Finale of "The Middle," WEDNESDAY, MAY 23 (8:00-8:30 p.m., ET) on the ABC Television Network. (ABC/ERIC MCCANDLESS) PATRICIA HEATON, ATTICUS SHAFFER, EDEN SHER