Well as far as “Lemmy welcoming committees” go, there are already quite a few from what I can tell. So I wouldn’t invest time in that but it’s up to you, of course. I mean, you’re offering a community named “Reddit” and people won’t be coming here for that anyways. Seems natural share Reddit-related info and news, at least to me. Otherwise you could have named the community something other than “Reddit” :) (e.g. “Lemmy Newcomers”, “Reddit Refugees”, etc.)
Just my 2 cents on that topic.
Personally, I can say that I’m sorely missing a central place for news on the Reddit situation/fallout. Some technology communities have been providing the news I’m looking for but this could be a more relevant source.