ive never been invited either... or sent any stuff to try :( it sucks!! i think you must have to have a certain amount of followers or something... :/ x
You just need to have your email address on your blog so the PR companies can email you. I got invited to the Garnier event (which I couldn't make) although I only had like 80 followers.
Once you get more well known and more views I think they'll start sending invites, it's just a matter of time before they find you! I think I'd be blogging for about 4 months before I got an invite to anything. xxx