Ngl the 19th of December looks like a great day to host something like a 1v1, 2v2, 3v3, Protect the king, or musket sword mix.
Actually, I am fully up to hosting something myself but I cant make up my mind really, and I am not really sure if enough people are interested when we generally speaking have a well-functioning egs.
Make a duel tournament on the 19th and you'll probably have 64 players.
Make it with groups of 4 with best 2 going through so everyone play at least 3 matches.
If you want, make head of series. If you have 16 groups in total, make 16 or 32 head of series so the best players don't face eachother in groups.
That's what I did a few years ago in the french community and everyone was happy with it. This was not done on the EU scene for duel tournaments.
And if you have more than 64 players, the bests 3rd are going through.