Give students lots of time to work, and help them stay focused by asking them to constantly assess their understanding and mastery. The workshop is not about "fill stuff in" or "completing worksheets," but rather it is about understanding. Ask students to be experts and to teach each other, or ask students to circulate around the room to work with different people.
End the workshop with a self-assessment, either for students to complete orally in pairs, or by asking them to write briefly about what they have mastered and what they still need to review.