Hollow Earth Day | EventGuide

Occurrence:

2X

Hashtags:

#HollowEarthDay

References:

weirdnj.com/stories/local-heroes-and-villains/happy-hollow-earth-day/
x.com/popcultint/status/969180626741055488
facebook.com/colinelmore/photos/2875868092495413/

This event takes place twice annually, on the 1st of March and on the 22nd of April.

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See Also(3):

Flat Earth Day Godzilla Day (Japan)National Sasquatch Awareness Day