One tool which has been effective for me includes "breaking the ice" or what I refer to as "Aerobics for the Mind" prior to each class.
It may involve posing a slide question such as" what message would you put into one million fortune cookies " ?
It receives an engaging response and helps get everyone involved before official class business begins. It also brings some light humor into the lesson which in my mind is so needed in our world today .
Roy R.