Yes, but the lunch entertainment doesn't start until later (I think the first show is around 1:15). We had an 11:30 reservation and it was a looooong wait until the show started.
Copied from the great website of Steve Soares: http://www.wdwent.com/
(Currently says) Experience the excitement of Oktoberfest with a festive dinner show in the Biergarten.For dining Guests only Daily at 1:15, 2:15, 3:15, 4:45, 5:55, 7:00 & 8:05pm times unverified
Length of show: 25 minutes Oktoberfest Musikanten CDs
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