Quando foi o 4 de maio o primeiro celebrado?

Parece que 4 de maio de 1979 pode ser a referência mais antiga para qualquer referência de 4 de maio.

One of the earliest known records of “May the 4th” used in popular culture is in 1979, as described here by author Alan Arnold while he was chronicling the making of The Empire Strikes Back for Lucasfilm:

Friday, May 4

“Margaret Thatcher has won the election and become Britain’s first woman prime minister. To celebrate their victory her party took a half page of advertising space in the London Evening News. This message, referring to the day of victory, was ‘May the Fourth Be With You, Maggie. Congratulations,’ further proof of the extent to which Star Wars has influenced us all.”

Foi primeiramente celebrada em Toronto em 2011 pelo Toronto Undeground Cinema, com concurso de maratona de filmes e fantasias.

Desde 2013, a Disney tenta torná-lo um evento mundial e de marketing.

Para a história, "May the Fourth Be With You" veio em primeiro lugar depois de Margaret Thatcher se tornou primeiro-ministro do Reino Unido em 1979.

Fonte: link