override plugin feature names like 'event'

Is it possible to override the names of items in the BuddyPress Group Calendar plugin? Specifically, you call things "events" in the plugin. However, I have another events manager feature for other kinds of events so this would confuse the users. I'd like to use the term "activity" for these Groups events in your plugin . So I'd like to change group events to group activities everywhere in the plugin. How could I do this?