Just an idea here, but maybe starting with a weekly news update - an ongoing pinned thread in the Indie Spotlight category or something - about current events on the site or a weekly summary of activities. Kind of the recreational director on the Love Boat or something like that, informing in summary what is going on with the site and pointing out opportunities. That's something a community can benefit from, and it might help with this idea of rounding up volunteers to "do something". First, you need to know what is going on and have an appreciation of the site's culture and direction. I'd say that's something you, Bryan, should start since you probably have the best overview of all of this. Maybe someone would volunteer to pick it up at some point.
People like to know what's going on, so it's up to someone to communicate that in a meaningful way. Also, creating a bit of excitement without it being fakey or contrived can go a long way. Just pick up on what's naturally happening and see where it can go or suggest creative ideas for where it could go. As I said before, I think this is a leadership initiative. Just start it and try it out for a month or something and see what the response is. When the community sees leadership taking that interest and initiative, it may spark other things. It indicates that there is ongoing support for what is happening.
In particular, the status of the site and the "leadership team" are key things to be transparent about. Since many of us went through the meat grinder of the RR collapse, we're naturally a bit shell-shocked about how a site is run; or how it's perceived to be run (which can be rectified with communication). For instance, I have no clear idea who the moderators/leaders currently are or who is involved or not involved. I mean, I guess I have some idea, but lots of questions. The site started out with Bryan (Holster), Coldroom, Boz, Paul999, Big Al, and Cptfiasco IIRC. Oh, and Electriclight, but he seems to have bailed? Nobody talks about these things. It would be better to get it out in the open and be transparent. You know what they say: "Elephants never forget". Bryan, Coldroom, and Boz are very involved still, Big Al posts occasionally. I haven't seen anything from Paul since his Metal Contest. Not a peep. Cptfiasco either.
These were the appointed leaders and volunteer do'ers was my understanding. Maybe that has changed? I think it would help to keep everyone updated on these things, to build trust and confidence - especially when it comes to asking for additional volunteer efforts. And a news update weekly (or frequently anyway) would help keep everyone on the same page. Maybe mention new members to the site to officially welcome them, mention special Badge upgrades or accomplishments, successful thread topics, music industry highlights, etc. Your typical watercooler, newsfeed, Entertainment Weekly type thing.