It's about location and gear if it's to be a workshop for beginners or photographers curious about large format.
Your location should have a high density of worthwhile photographic subjects (that appeal to many photographers), so that schlepping around of large format gear is kept to a minimum. If you've got a lf camera collection that your willing to share for that day out, that'd be ideal. Two participants to a camera, or even a 1:1 ratio would be ideal. All they'd need would be old but functioning Graflexes or something like that. Or you could rent something, or strike a deal with a camera manufacturer or shop.
And don't count on doing photographs that day yourself, you'll be answering questions and jumping from person to person all day long.
Best regards, Christoph