A great anytime game for practicing speaking and listening skills in a fun and relaxed way.
One student sits with their back to the board/screen. The teacher projects the photo slide on the board. The student must then ask yes/no questions of the class to try to guess who or what is being projected behind them. If they get stuck, they can say "pista" (clue), and a student volunteer from the class can give them a hint to help out.
This set includes a wide variety of people, places, and things, but this could also be edited to have a more cohesive theme/used as a vocabulary review.
I would recommend modeling an example with the class before beginning and also choosing one of your stronger students to start off.
This works great as a sponge activity or for days with shortened periods.