As far as I know, there are valid rules about asking permission to glomp someone, but group hugs might be excluded. I do know, however, that glomp circles are not allowed on con ground, which is why they are always in the park (even when they are little). The best you can do is report it to con staff, but I don't think they can do anything since they have no control over what goes on in the public space. Maybe if we make the rules video a little more specific, people will be more understanding of what's going on around them?
Poor Tala. : ( I'm sorry that happened to you. I think sticking in groups is the best option, but that isn't always fun, much less always an option. And I think anyone who uses physical force, like hitting, should be reported even if they are in the parks. Still, I'm not sure if staff could do anything.
But hey, discussions spread awareness!
2. Always be polite and ask before hugging (even if someone says no).