20th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (which will happen in November 2012 in California). Geographic Info Systems now also subsume recommender systems! Naturally, no movies here: these papers are all about location and mobility.

• Location-based and Preference-Aware Recommendation Using Sparse Geo-Social Networking Data. Jie Bao; Yu Zheng; Mohamed Mokbel
• Personalized Trip Recommendation with Multiple Constraints by Mining User Check-in Behaviors. Eric Hsueh-Chan Lu; Ching-Yu Chen; Vincent Shin-Mu Tseng
• Probabilistic Sequential POIs Recommendation via Check-In Data. Jitao Sang; Tao Mei; Jian-Tao Sun; Changsheng Xu; Shipeng Li

Reminds me of a talk I gave on location vs. people. Be sure to also check out all the other interesting papers that don’t have recommendation in the title.