APPLETON, Wis. — Lawrence University faces a huge challenge this weekend as it takes on No. 1-ranked St. Norbert College in a home-and-home Northern Collegiate Hockey Association series. The Vikings travel to De Pere, Wis., on Friday for a 7 p.m. game at the Cornerstone Community Center, and Lawrence then hosts the Green Knights at the Appleton Family Ice Center at 7 p.m. on Saturday.