Might be worth making a dedicated Lemmy community for "going live" style posts, otherwise there's a risk it could flood the community. Or worse, people would second guess themselves wondering if they were "worthy" to post such an announcement.

As the mod: go for it. As long as it’s not over the top I’m cool with it. A vibrant community is good 👍

Not every time though: but like, now and then a reminder people do it and such is all good.

a community for it makes sense to me, gives a lot of flexibility for filtering to relevant categories, keywords and such, without fear of causing noise/clutter, and that still leaves the door open to cross posting to specific communities too where it makes sense