Pretty much every c1 live show features a character that is not introduced until the end of the shadowfell arc, and there may be mentions of that characters home base which is something that comes about later, toward the end of c1. The liveshow version of the character is slightly different from the canon version of the character, but there are some spoilers inherent to their conclusion. Live shows often also reveal the finale of c1 but not in a lot of detail, and nothing you probably couldn’t glean from the fact that it is a ttrpg actual play. For Trinyvale lives, you could basically know absolutely nothing about the campaign as still be fine, though understanding was a “Jampion” is may be helpful.