Hollow Earth Day

Occurrence:
2X
Hashtags:
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 March 1st and on April 22nd.

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See Also(3):

Flat Earth DayGodzilla Day (Japan)National Sasquatch Awareness Day