A thought! 

For the people who do the livestream viewing things.

Find a bunch of Christmas episodes of Magical Girl shows, like Sailor Moon, Precure and Ojamajo Doremi (the latter I know has at least three) and host livestream events where we all gather to watch these episodes.

Brilliant! Right now the staff is planning stuff for the holidays! We will discuss about this idea. :D

We will at least be showing hearts in ice from sailor moon, and others like it. we just have to get it all sorted!!

Cardcaptor Sakura has a christmas episode! <3 Two in fact!

Which numbers are they?  I could find the HD fansubs of them.

I dont remember. It's the episode where Sakura gets Firey and then other is when Mirror and the cards make a present for Sakura.

I will look for both of these.

The first Cardcaptor Sakura Christmas episode was 35. It was the finale to the first season.

I believe the second was Episode 61. The following episode is described as involving a New Years festival, so yea.

And just for good measure I'll list the other MG Christmas episodes I'm familiar with.

Tokyo Mew Mew has a two-parter in episodes 37 and 38

Ojamajo Doremi
Season 1: Episode 45
Season 2: Episode 44
Season 3: Episode 45

A couple of things though. The season 3 Christmas episode is part of an ongoing character arc spanning all three seasons. And Wikipedia doesn't seem to have the four season's episodes listed. I haven't finished the Fourth season, but judging from the pattern the episode should be somewhere in the 44-45. 

Fresh Precure's Christmas episode is episode 45
Heartcatch Precure, Suite Precure and Smile Precure all have one in episode 44

One thing I've learned from watching Toei-made Magical Girl shows is that they span most of the year they air, and Holiday episodes air around that time. This means that Christmas episodes will happen late in the season, usually around the point the final battle is due to begin.