1.) Establish a learning goal. Have a mechanism for communicating the learning goal.
2.) Develop learning activities. Write rationales, which include whether the students will be learning procedural or declarative knowledge, and whether or not the activity is intended as a formative assessment. Communicate the activity's objective, necessary materials, procedure, parameters for expected final product, and, if necessary, grading rubric.
3.) Have a system for communicating the results of the activity. Provide feedback on both the results and the process of the activity. If it's an assessment, have a method for recording the results.
4.) Hand back student work. It does nobody any good sitting in the bottom of your briefcase.
You have 23 hours. Go.