A Guitar workshop is like a Guitar class led by one (or a couple) of instructors. The workshops are generally themed (i.e., Blues Guitar Licks, General Maintenance & Repair of your Guitar, Metal Shredding/Sweeping, Understanding Scales, Learning/Using Power Chords etc.). There may be a cost associated with the workshop as some of the workshop's would be hosted by a professional instructor. I would anticipate the cost to be no more than $20 per person per workshop. But, you would get take home materials and a full lesson if there is a cost.