[cameron.lynn]

We have a Facebook group and a Twitter in addition to an email list, so we get almost everybody that way. Individual people can ask to be called or texted information, but because that gets to be a lot of information we only do that for the people that ask. If someone doesn't respond or show up for a while, we try to get in touch by emailing and calling them, and if they don't answer after that we cut ties.
People on my team generally answer, but it's also a good indicator of who's staying on top of things and who's the most active in the group. Often we end up badgering the same people, and they are usually the same people that will come late, or not show up for a while.