Don't waste time on your environment.
For both hosts and participants, a lot of times doing an Android based code-lab or workshop feels like being given a box of screws and a hammer, and being told 'get to work'. One of the major problems is that getting the Android development environment set up initially is not trivial, and fairly error-prone. As a result, many times workshops end up being mostly about setting up development environments, and very little about actually building stuff.
This project provides a VirtualBox image, along with instructions, that can be distributed on a flash drive, with everything set up and ready to go.
For participants:
During the event, pass out a flash drive with the VirtualBox installers for every system, as well as Environs.ova. Have participants install VirtualBox and then import the Environs file. (They’ll need about 30GB free disk space.)
If you want to use this in your own workshop, pull it down, and try it out first. If you have a specific sample project(s) that you want to use, pull it down, import it, and test it out before putting this on a bunch of flash drives.