Rabbi Dov Linzer's shiur from Sunday, December 20, 2009
is available at :
http://bcbm.org/live/lecture.php?740361/Rabbi_Dov_Linzer/Entering_into_Churches_and_Mosques_12-20-09
Topic: Entering into Churches and Mosques. What is the halachic definition of avoda zara and how is it applied to Christianity and Islam? May one enter a church or a mosque to attend a funeral or wedding or to observe a service? Is it permissible to enter to view the architecture or attend a concert?
