Start by introducing yourself and explaining what YOU want them to learn. Include links to the workshop etherpad and explain that you're keeping a pad to stay connected, catalog links and share work. Ask questions to get an idea of who's there and peers that can pair up to help one another.
Feed people. Or at least give them coffee. It's good to give people a topic to talk about while they're eating.
No one has to work alone. They will work independently, but with peers. Oh, sounds impossible? No, participants get to ask the person next to them for help instead of raising your hand. This isn't elementary school! Explain that you'll be floating and help people that get stuck. Tell people to work with people they don't know!
Everyone forms groups and collaborate to do the Hands on Hacking Hacktivity (for example the Cultural Heritage Remix Hacktivity). This make session is about team work and composition. How do groups work out the design challenge? Advise that they can make multiple pages, but that they should set requirements and plan together. Each group plans, collects assets, builds.
Use the closing circle to see what everyone made and ask questions like: