Lunar Token in pre?

What can i do with it. Is there a party in pre-searing also?

Don't think so....
While the festival is going; all monsters across the three continents have a possibility of dropping them.

As an add on to Frazzy's question, why are they wanted so badly?

So you can get a minipig
Also because they may possibly be needed for the hat

It has already been confirmed you don't need tokens, or anything, to get the hat.