I can personally confirm Slovenia being empty during summer months. I was there Aug/Sept. 2010!!! Everyone goes to Croatia for the summer, and all nightlife is pretty much dead in Ljubljana. Unless you call a nightclub packed with 200 men, and 30 women "very good" as the bouncer at the door told me one club was.
Avoid Slovenia from June until October 1st!
Mixx
Avoid Slovenia from June until October 1st!
Mixx