The Megavalanche week in Alpe d’Huez will run from the 12th to the 14th July 2013.
You can enter the event online at http://www.megavalanche.com/ . It should cost less than a 100 euros for the week. The price includes race entry and your lift pass for your time there.
Entries go online at the beginning of January. For the 2013 megavalanche you should be able to enter from January on the above website. In past years the organisers have made more spaces available once the initial batch have been sold.
You will be given a race number and your grid position at the Palais de Sport in Alpe d’Huez. If you have raced before or are a half descent named rider then you will be given front row status in one the qualifiers. For the rest of us it seems to be pot luck where you get placed.
The Megavalanche week also has a trade stand area in the cetnre of the town where its sponsors (and a few shops) will advertise and sell their stock. Brands like Hope and Fox and SRAM are usually there to help out on repairs etc.