They all sound extremely powerful which wouldn't be a good thing possibly since players that come after those events would be weaker because of it. Don't get me wrong they all sound pretty cool but if they were too powerful it would be a problem then there is also the issue of our devs having to try and code, design, and balance them in a very short time before the holiday. Maybe this could be done something a bit farther out say christmas so they have a bit more time but for now players could maybe receive an aesthetic gift for the holidays.

I think things like special mech "costumes" or simply visual changes on items already in place would be good. For example for halloween give players a skin to make the hook look like a jack o lantern flying out biting the other mech and then pulling it back.