Because it's not an important holiday to people anymore. The only ones people like to celebrate are:
New Year's, lonely on Valentine's day, promoting Christianity by pretending to be another ethnicity and drinking a lot day, chocolate bunny day, rainbow month, fireworks day, youtuber/gaming season, kids complaining about school season, pumpkin spice season, spooky month, politics season and Christmas day - but people forget about the religious part.