There's an Oktoberfest Event in Avalon Park (right in the area down Alafaya) on Saturday, it's also family friendly. I know it's not the track but we could go to the track on Friday night which is a "Run what you brung" night.

Friday night drags ($10 spectators, $15 racers)
http://orlando.eventguide.com/events/e100753.htm

Oktoberfest Event - Sat (Free)
http://orlando.eventguide.com/events/e101695.htm