The TCA is held in Pasadena - kind of east a bit of Los Angeles (the city) and is in Los Angeles County - and, I think you have already answered the question re: whether it is open to the public (it is not), correct? Thanks again for keeping it spoiler free. The Guardian seems to have thrown what amounts to the likes of a child's tantrum - how embarrassing for them - though, they probably don't care or they wouldn't have done it.
Thanks for the info on where its held. And yes industry only.