I have been guilty of lacking zeal. Perhaps you would join me in a prayer asking God to forgive us for this lack of zeal and also to empower us to keep our zeal for God high. If everyone does know each other's names, you need to work on outreach. If you have any new people, they probably don't know everyone's name and will appreciate this kind of exercise each week. Although there are several places, the most common one is Luke 2.
Every mature believer ought to know the basics of where certain passages are.
Spend a little time discussing each of these to make sure that the basic facts of the story are in everyone's mind. It is a good idea for you, the teacher to bring to the table some information not readily available in the text. For example, there was an interesting tidbit of information on page 121 of Broadman Comments about the historical veracity of Luke's account. A trick question. A greatly romanticized, other-worldly term that does not adequately communicate the crude nature of what this was.