The Dutch VMUG event attracts a lot of attention. In September 2005, the first time this event was held the number of attendees was around 50. This number has risen over the years. The next event will take place on the 12th of December and is open for registration. The Dutch VMUG expects around 600 attendees. It looks like the Dutch VMug has become some sort of mini VMworld. 
Update : 450 attendees already have signed up for the Dutch VMUG event.