[HUE]

If they've been taught with the Grammar Translation Method, I'll bet that any activity in which they stand up and use English (interview games, bingo, board races, etc) will take them by surprise. This will generate interest, whether you've found topics of interest or not. In fact, they may at first be slightly reluctant because of the huge switch in how to learn English. Use these first few sessions to determine what activities work well, where their interests lie, etc.

Good luck, and welcome to the profession!