For the "Aran" event, questions.

1) Are the rings part of the event? Or part of the Aran storyline? yes, I haven't gotten to 30+ yet.
2) Are the medals part of the event too? I believe THIS one is event, but I wasn't sure about the rings.
3) How many of these rings can you equip on a character? Is it '4'? Or '1'?

So if someone could clarify for me, that'd be awesome. Because I don't want to get my Aran to 50 and then having to do that for no ring. ):

1) The ring event ends in June.
2) The medal event ends in Jan 19th.
3) 1.