Get out those jazz hands. Matilda has been made into a musical.
If you go to The Roald Dahl Museum and Story Centre, you can peak inside his Writing Hut or eat at Café Twit, although that doesn't sound all that appetizing. (Source.)
If you're looking for something to celebrate, Roald Dahl Day is every September 13.
For all you competitors out there, suit up for the Roald Dahl Reading Relay. You'll even earn an "I'm a Revolting Reader" badge. Now who wouldn't want one of those?