I have an event plugin, Space, that had a flame turret that killed a player. In the chat it said that it was my flame turret. Is there a way to identify event owned traps and have them show something else? Why did it say I owned it? 

We get the owner information from the entity passed to us directly from Rust. We have no way to distinguish that it's from an event or if it's just a vanilla trap. The owner information is put in there from whoever builds/uses the entity, which in this case would be that plugin. You could ask the plugin dev if they could make the trap owner a customizable (such as with Steam ID) setting. The only other option is to remove the {owner} variable from the DeathNotes config for the trap death message, but then you lose that information for non-events, of course. Apologies that I couldn't be more helpful here.