Eleanor is there to watch because it's Quidditch, man! What the hell. She's not going to play though cause she'd die.
Julia probably came to watch Margo play because that's amusing. (Seriously, she does need to hit things...)
If Jake hears about this in time it's right up his alley so he'd come watch but I'm not too concerned if he misses the first match. There's gotta be more!