The Google Friend Connect Event addon is something to see, and is definitely something I think I’d consider if I was organizing a local Tweetup (or perhaps something even bigger?).
If you’ve got Google Friend Connect already installed, it’s as easy a few more button clicks to get this thing setup as well. Copy the embed code and you’re good to go.
What’s nice about this particular widget is that you can not only see who’s coming, but you can have all the deets right there on the widget, the time, location, as well as a functional map.
I think the mapping aspect is huge, especially for people who stink at directions (like me).
Check out the sample site for a feel (the screenshot to the right is from the sample site) and then let me know if you’re going to use it (or if you’ve already used it).
Again, I’d love to see someone use this for a local Tweetup…! If you’re interested in something simpler, try Twtvite.
Here’s a demo vid of how it all works as well: