In terms of the actual events themselves, I think you need to look at a combination of things. You need to look at the location, as well as any indication that there was motivation of hate.
For example, I'm just thinking that the Muslim community has prayers that it conducts sometimes in public halls because spaces in mosques are too small to accommodate everyone. If you had, for example, a hate crime committed there, with somebody spray-painting, “Go home, Muslims”, or something like that on the building itself, even though the building is not purposed for religious use, one would have to conclude that there was a link there, if you had that kind of explicit connection between the crime and the motivation and the fact that there was recently an event there where a large number of a particular group may have been.