I realize based on your answers that I wasn't totally clear with my instructions. By "conference" I meant an event where there is a topic and are speakers and a schedule and people go to hear the speakers and talk to each other about the topic at a specific date and time.

By "event" I meant again some kind of happening that was time based but this time it didn't have to be a conference about a topic but could be any event like a concert or whatever.

You should choose at least one conference site (you can choose two if you like). The other one can be an event if you choose only one conference.