Different from groups mentioned before, event-based groups mainly include offline events, which means members will meet each other when they participate in events held by other members in the same group. Intuitively, friend relationship plays a more significant role in users’ decisions to join this kind of groups, which needs to be addressed in this problem. Besides, the nature of real-world events indicates location information should be considered in the proposed methods as well. Yet, previous research methods in group recommendation do not exploit location features of users and groups