May Day is an event in New Horizons. During this event, special May Day Tickets can be used at the airport to go on a tour to vist unique islands. On the special tour, there seems to be a maze, and at the end, a special tool.
May Day Ticket:
A May Day ticket is given for free as a thank you from Nook Inc. to players that have worked hard on their island. When you go to the tour, there is a villager, just like any mystery tour. You may also encounter Rover.