This is a good time in the semester to review ways you can encourage students to engage actively in their learning. The online Teaching Guide for GSIs offers some excellent strategies to use in a variety of GSI-led settings.
Active Learning Techniques
Managing Lab Partners and Groups
Asking Effective Questions
The Pre-Lab Introduction
In addition, many more GSI ideas on implementing participation, discussion, and group work strategies are linked in the Topical Index to Teaching Effectiveness Award Essays.