Roy G. Biv Day is an event in Moshi Monsters which happens once every year in April, typically around April 10th. 

Roy G. Biv comes to Monstro City to make sure that there are rainbows all year round, even though there isn't any rain.

The holiday was created by Jenny.


Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.