Both Jet Pack Guy and Dot are visiting for the Noir Party on Club Penguin Rewritten, and some of the visits have now begun! As a result of this, the team have released meet-up times where mascots will appear, though it’s worth noting that they’ll still be appearing randomly too; the mascot trackers should be useful for the latter, particularly since those are less crowded! You can find all the scheduled meet-up times on the trackers.
The backgrounds which you can obtain by meeting them can also be seen above. They’ll be making plenty of visits throughout the event, so good luck meeting them!