My local was colonized on by a national in 2000. It was very sad b/c I had been had officer in my local so it was very sad to see something I had worked so in just disappear. Currently though, some of us are working to try to establish an alumni chapter so we can at least keep in touch and talk about "the good ole days". You should definatly talk to your national and try to get TriDelts in your area together. Even if they aren't women that were in your chapter, its nice to be around your sisters!
And I can completely related on how sad it is to go back to homecomming and not have events to go back to. Homecomming is some years so very sad.