Originally Posted by HungryHunter

somehow I don't even have any teasets to fight the boss LOL

You have to BUY Tea Sets in the Event Shop for Fruit Tarts. Yes, the same currency required to buy the girl, her blooms, ampies, etcetera.
Furthermore, you can battle only ONE event boss per day. So getting 4 pieces of jewelery *will* take 4 days. Getting all 8 pieces of jewelry *will* take 8 days.
The Tea Sets will take a fair chunk from your event currency, but I do advice buying a couple next time you log in, and start on those bosses right away.
Do not postpone till the last day of the entire event, you will regret it if you want the jewelry!