Where did you see that Beltane was on April 29th? From all the posts I saw, nobody ever said anything like that. HP Pythia's sermon about Beltane obviously wasn't referring at all to the day she wrote it! The date on the title was simply the date she wrote it. If you really read it it says:
Beltane aka as May Day is a very important Pagan holiday. Jewish communism hijacked this day and turned it into a major communist holiday, no different from how the Christian Church hijacked all of the Pagan holidays, and attempted at making them their own, which they are not.
Beltane is on the 1st May. April 30th is the Eve of Beltane like it's been said, and many celebrations are done that night.