Strictly speaking, this was the day the womens’ version was formed, but I understand it’s hard to act out a W.

Transcript:

Mr and Mrs Bugg and two of their friends are standing in a line, their arms raised and curved and bent to spell out the letters Y, B, C and A.

The text reads: “Febuggary 10, 18970: The YBCA is founded in New Bugg City.”