The posted recipe will get you damn close. Here is the Summerfest info from SN's website, might help if you need to make adjustments for efficiency or alpha acids.
Alcohol Content: 5.0% by Volume
Beginning Gravity: 12.2 Plato
Ending Gravity: 2.8 Plato
Bitterness Units: 28
Malts: Two-row Pale & Munich
Yeast: Lager Yeast
Bittering Hops: Perle & Saaz
Finishing Hops: Saaz
Cheers!
Kevin