In the comments to michaellee's post here about Convergence, there's some discussion of the fallout from the HRMP Wars, which are directly responsible for the creation of Convergence and Marscon as well as the implosion of attendance at Minicon, which latter was the intended purpose of the HRMP.
As I've discussed here previously (no link, can't be arsed to look it up now) the current situation in MN fandom is what badger2305 was asking for when he suggested the "two Minicons" option to the MNSTF board way back when. You have one big tent convention, and you have a much smaller convention that's more oriented toward literary fandom. You also have Marscon, which is more of a media/gamer convention, and Diversicon, which was born of an earlier split. I think it's a good thing that michaellee and others are thinking about how to keep the big tent open to people who want to be part of the community while keeping the people that are just there for the party to a minimum. It's a hard row to hoe. Building community in fandom has historically been difficult, because so many fans have social issues to start with, and because fandom also falls prey to Balkanization due to the many portals through which people get into fandom.* Still, MISFITS does a pretty good job of recapitulating MNSTF's success at providing social outlets for fans between conventions while avoiding the politics that eventually led to the HRMP.
Now, over a decade after the HRMP Wars, Minicon has been struggling to recover from the faux pas of antagonizing 90% of Upper Midwest fandom. Apologies have been made, hands extended in friendship, and open bars restored to the consuite. How much this has helped, I don't know. I hear that attendance has improved from the abysmal numbers bruited about before Greg Ketter was induced to become Chairman, but frankly, I don't care enough to noodge jiawen, jolest, or any of the other people I know who attend. Honestly? I wish them well. The people running MNSTF these days are not those responsible for the HRMP Wars, and shouldn't be held accountable for them, but I understand that emotions don't always respond to reason. Perhaps it might benefit both Minicon and Diversicon to combine forces, since they do so many of the same things, and Diversicon has long suffered from its scheduling opposite the Renaissance Festival.
All of the SF conventions would do well to pay attention to the huge number of anime fans that showed up for Anime Detour and Kakkoi-con. While not all of these otaku have an interest in SF & fantasy, the chances are that some of them do, and might be attracted to another convention that speaks to those interests. I strongly urge MNSTF, SF Minnesota and the folks who run Marscon to spend some time and money wooing the otaku. This is the new generation of fandom, and fans can't afford to treat otaku the same way Trekkies were once treated. Get them in. Get them involved. These people are your future, and you need to pay attention to them.
*You could even argue that trying to define fandom as a subculture is a meaningless exercise, since SF & fantasy are so popular with the mainstream these days, but I don't agree with that.