International Museum Day Guide - Animal Crossing New Horizons

Once you've built the museum, you can immediately participate in the stamp rally event.

Starting on May 18th and ending on May 31st, this promotion resets at 5 am every day.

Step 1: Talk to Blathers to start, after getting to the museum.

Step 2: From the bug, fish, and fossil wings, collect 3 stamps.

The stamps are in a different place for everyone.

Look at every corner of the museum.

Step 3 Talk to Blathers, after Collecting all the stamps.

At the same time, you can't Collect all 3 rewards.

After completing each separate one, talk to Blathers.