I'll be 100% honest. IMHO the reason it was able to work out so well, is because most of the people there met each other previously and knew each other. I don't think I'd go to a random shabbos DO with someone I literally met online and have no clue who they are.
So if you've never been to a DO and have no clue who anyone else is, don't expect to be invited to a shabbos DO. How should I know that I can trust your karshrus? DDF has the benefits of having people from all spectrums and everyone has their own opinion regarding kashrus.