There are a limited number of tickets available, you can submit to get tickets:
Find out how you can be eligible to attend http://unvrs.al/FSDOFRSVP
I hear it is not restricted to US Only.
I’m assuming you can only enter once, but I have asked to clarify that. UPDATE – I asked Official Fifty, it’s not a giveaway where more entries will increase your chances. So you only need to fill the form out once.
I have no idea how they are picking, but winners will be chosen the week of January 9.
I’m not sure what theatre, there are a few different options in LA though.
I’ll update when I become aware of more details.