The Gucci pre-sale starts Tuesday, May 20th. The event is by invitation only but email me if you need a contact or an invite. I've personally never had a problem, they are usually very nice. Either way, when you get there you want to get the master sale list, which contains all the items are included in the sale. If there are things you want you must pay for it on that day but you will not be able to take the items home until the sale officially starts on June 3rd. Of course, you'll get a recepit plus a Gucci hold ticket. Then on Tuesday, June 3rd your item will be ready for you to pick up.
The sale officially opens to the public on June 3rd. Some say that the good stuff will be gone by then but if you're like me you'll keep checking back until there is a second or third markdown.
Courtesy of Val_twig from TPF.