I haven't received my invitation email yet (I had 5 referrals in the current program). I inquired and got an email from a Tesla rep today saying I am indeed a confirmed invitee to the GF event (yay), and I should be getting actual the formal invite email "soon" but it hasn't shown up yet.
Based on the non-official confirmation email, I did go ahead and book a flight and hotel but it's unnerving to not have the actual invitation email.
For those who got and confirmed the GF invite: after you confirm did you get some sort of "pass" or confirmation ID number/code/graphic/pdf etc?