Some of my suggestions:
1. When it comes to individual levels, most likely the level will be a new level that is not from LemmingBytes. I've sent one to Arty as well.
Another level to play is the Honeycomb Collab Level. I haven't gotten work on it at all unfortunately, I haven't had the time to do it and still don't know what to contribute. Not to worry though, I'm not abandoning this project again and I will think of something.
2. Random packs:
Zemmings Vol. 1 is a strong recommendation if you're looking for a small pack. There are only eight levels, but all of them IMO would totally fit in Orig Lemmings. Even the last level, while difficult, is still easier than many hard levels in others' packs! Plus, can't go wrong with the Glacier tileset!
Doomsday Lemmings. As we are closing in on Halloween, why not a small 21-level pack of frightful zombies!
Any of the
Lemmix-to-NeoLemmix NXPs. However, I don't think they work with the current version of NeoLemmix, the NXPs are only in v1.43n-F and it will give a backwards compatibility error.
3. I'd be happy to watch a Pokemon stream by you! That would be interesting. I can't think of any challenges you should do; for me, I would just play it without challenges and refresh yourself since you say you haven't played Pokemon in a while. But it's up to you.
4. Emily is Away, Contraption Maker, DROD. Eversion (though you said the game got frustrating at one point), Mousecraft. That's all I can think of.
I'd suggest Twitch, mainly because the Game Chat is recorded along with the stream. The Game Chats of YouTube streams I think are not saved.
I have a Halloween party to attend on Saturday night, so Friday night or Sunday will likely be better days for me.