I did this last year using Wyeast 1007 German Ale. It worked out really well, and I'm planning to use it again this year. The major drawback is the beer won't clarify like a good oktoberfest should, but this yeast is a really nice alternative if you don't have lagering capabilities. It's a clean fermenting yeast that works really well for this style.
JRBrewer on Untappd
Planned - GP/Mosaic SMaSH
Fermenting - Ned's Red (Flanders Red Ale), Saison Graf, Tangerine Mead
Bottled - Belgian Tripel, Belgo Graf, Saison (split batch with brett), Black 13 (Graf Porter), Old Style Amer. Cream Ale, Amber Graf, Wheat Graf, Bannockburn Wee Heavy, Berry Mead