like in title, pls ping

Maybe try to read that thread

https://www.sylestia.com/forums/?thread=69684... also it is explained in the appropriate part of the site

Here

Is when you bid on eggs and they all start...Don't really know it works..

PS: Like all limited games there is a limited time...So yeah

I think i know how it work... but what eggs is there?

Well we don't know, do we. They're blind auctions. You don't know what you're bidding on. Some you can get a vague guess on because of the price they start out at but other than that you won't know until the auction is over.

So there can be common pets what i can catch? I mean this pets which dont have any visible gen/mutation

They're going to be themed pets. Whether they're themed that you catch in the wild or retired themed we don't know. Most likely there will be at least one visible gene. There's also the possibility that some are not even pets.

All of the eggs will contain

either a Themed pet (in previous fests, if there are Majestics, they'll be in egglings 1-4, Fabled species+puff would be in 5-12, and regular species would be the rest.)

Aside from pets, 1-4 would possibly be (again going by previous fests) Forum Game avatar items + Mystical Essence of the winner's choice, or a custom 3-vis pet

Black friday last year, the prize tiers were
"Choice of any 3-Visible Wheel of Themed Pet (2-Vis if Restricted), [Wheel of Themed Ticket] x5, Choice of any Forum Game Avatar Item"

"[Wheel of Themed Ticket] x3, Choice of any Forum Game Avatar Item"
and

"[Wheel of Themed Ticket] x1, Choice of any Forum Game Avatar Item"

instead of actual theme pets