@PhantomPanda88 - All eggs claimed from this event, as well as all
eggs obtained from the accompanying rumble map, are safe to hatch
without affecting your shiny chain.
@LALVOE - To participate in the event, all you have to do is
interact with Pokemon. As you're interacting, you'll
randomly receive Light Balls

, collect enough Light Balls and you'll be able
to claim a few different prizes (if you haven't claimed these
prizes in years past that is, if that's the case, only the new
prize is available). You're able to check your progress and claim
prizes
here. (This link is also accessible from the first
post on the Index-Page).