Ah, I get your problem man. In fact, I've had a similar problem, that's why I'm developing a mod right now that can automatically warn you of such situations, named 'Causality'. ...But you'll prbly be finished with the game before I get to complete it :)
Anyway, here's where it went wrong: Right after the fireworks scene, there's a relationship threshold for Judie: 21 points or more. If you miss the threshold, you'll miss something special and you'll inevitably lose Judie's path the next day. Looks like you're one point short, you can clutch one more by getting all 5 questions right in the quiz about Judie during the festival if you didn't already. If you already did or have trouble doing so, you need to check out the official walkthrough on page 13 and work your way backwards, there's 26 Judie points reachable up to that point.
Hope this helps! Judie's path is not necessary to finish the game (no path is) but let's say you're missing a lot if you do. Same goes for Lauren. Good luck!