I somehow glitched into New Donk City`s Tallest building

It took a few attempts, but you can earn two power moons by playing the Jump-Rope challenge.

• 30 jumps: (#29: Jump-Rope Hero)
• 100 jumps: (#30: Jump-Rope Genius)

Any score above 100 jumps is just for bragging rights on the online leaderboard.

Yes, you can!

All you need to do is return to New Donk City and re-enter city hall. There will be a man in the left corner who you can speak to which lets you replay the festival.

Not that I think it needs much more explaining, but here's a video showing exactly who to talk to.