I have yet to experiment with any of this technology myself but I just spotted that Etienne and Beverly Wenger-Trayner having been doing some very interesting work in blending online and face-to-face conversation.
And none of this is using expensive or exotic technology, just everyday stuff such as laptops, smartphones, Skype and Whatsapp.
Take a look, you may well be able to use some of these ideas in your own workshops and get-togethers.