I liked grinding for girls in all the events, but my favourite as of now is the music festival.

The main reason is, the game is less buggy now compared to for example the last Christmas event. That was horrible, as when a girl dropped, pictures of ALL the girls I already had in the harem popped up, and the game crashed, along with the browser, and then whole laptop. Sometimes I could reload the page, and it would happen again, and again and again, until the laptop crashed anyway. BUT I have to add, the devs changed the game as it went on and I managed to get the drops during the Christmas event, so it's all good.

But since JessieChan asked I have to say, the event that made me almost give up was the Festival. Grinded (or is it ground? :P ) everyday from morning until night, and still missed Festival Solveig. Thought the game was broken. But as it turns out, RNGesus wasn't on my side.

I'm still hoping we'd get a chance to get the missed girls someday. For example, a chance to get the previously missed Easter girls during the next year's Easter event.