Is this able to be done?

I am new to RPG Maker VX Ace. Before I get started on my project, I want to make sure what I want to do can actually be done.

I want my hero to walk in and trigger an event that causes a boss character to appear and have dialog with the hero. At some point in the dialog I want another event to trigger that has 30 (yes 30) other sprites walk into the frame. And then have all 30 sprites and the hero attack the boss at 1 time. I want it to be basically like a cut scene and not a battle sequence.

Is this something that is possible? If so, how would I go about getting it done?

Again, I am new to this so the more details the better.

Thanks for the help!

This is pretty easily achievable. Every single character needs its own event (with the event graphic set to the boss/other characters), so you'll probably end up with 32 events on the map (30 for the attacking characters, one for the boss, and one for the event that runs everything). You basically need an understanding of using autoruns, and move route commands, it's pretty simple. I suggest you look through some beginner tutorials to learn about this. We have a nice tutorial forum with lots of newbie friendly tutorials, give them a try.