Allura is channelling Lucius Malfoy for a moment:
1. Mariana, I sent PMs to all the people involved in the plot who had RSVPed me saying they wanted to join in, telling them when the plot was starting and what to do. If you didn't get a PM, it's because you didn't RSVP, I had to assume you don't want anything to happen to your character and put you on The List.
2. The Death Eaters are just as impatient as you are. If you were supposed to be kidnapped but didn't get in contact with the people who were kidnapping you to plot it out promptly, you were replaced. We have two hostages already, and you should want to rescue them if only because some of you are related to them.
3. You can't just waltz in like you know what's happening. How does that make sense? You need to give yourselves a back-plot. I was scoping out the Forbidden Forest during the Masquerade Ball, for Merlin's sake! We're going to torture them, so why not use that time to first figure out that they're missing (it's a big school and if you believe Scorpius' post, they skip classes constantly), then look for them, then figure out they've been abducted, then find them.
Face it, you just want to fight us because you're bored. So make yourselves less bored by doing Order related things. Rush in like headless chickens and we'll slaughter you like the same. And when one of you does decide he or she is a curse-breaker (I knew Bill had joined for a reason) they ought PM one of my characters to find out what Lyra's wards were before they attempt to crack them.
See? You have lots to do. Go do it.