That is, the 500th anniversary of him becoming king. Or the 500th anniversary of the death of Henry VII. Or both.
From the L.A. Times (and written by Susan James!):
Best known of the English kings, Henry VIII has usually been portrayed as a gargantuan party boy seducing court ladies, quarreling with the church, arresting friends and beheading wives. But he brought more to the throne than that.
Bright, cultured and handsome, Henry succeeded peacefully to the crown as he turned 18, securing the Tudor dynasty and making possible England’s golden age.
Next year marks the 500th anniversary of that accession, and a variety of special events will be held in and around London to explore his life and reign.
A major presentation at Hampton Court, Henry’s magnificent palace on the Thames, opens April 12 and runs daily through the year. It focuses on one day in the king’s life: July 12, 1543, the day he married his sixth queen, Catherine Parr.
…
Beginning Oct. 31, 2009, the palace will host a series of ghost tours through candlelighted rooms, including the Haunted Corridor where Henry’s fifth queen, Catherine Howard, ran screaming from guards sent to take her to the Tower.
Tudor Christmas (Dec. 27 to Jan. 1) will be celebrated with traditional music, dancing and live entertainment as well as an open-air ice rink.
Check out the full article for more upcoming events at Hampton Court and other places around England.

I read about this! Very exciting! Wish I could be there!