Our own Huntsville Amateur Radio Club, HARC, is very active and is associated with sereral local organizations.
The third weekend in August each year marks the time for the Huntsville Hamfest.
Bill Brown, a locam ham, launches a few ATV packages aboard balloons each year. He posts information on his website on the flights he organizes.
Leonids Online Covers astronomical news regarding comets and meteor showers. Ed Myszka, another local, launches a balloon yearly during the height of the Perseids shower in hopes of sending down a live meteor sighting via ATV. Check the online site for any upcoming flights.
And finally, for links to many other ATV groups across the globe, check out ATV-TV.org.