How is the video supposed to relate to the theme?
Video entries can still be very creative. They simply need to focus on a broadly defined communicative situation. This year that is an international sporting event. Students might pretend to buy food at concessions, help a speaker of the target language find something, figure out how to get tickets to a sold out event, ask questions about a game, explain an aspect of American culture to non-English speaker, create a video to advertise their hometown to visiting athletes, etc… There are lots of possibilities, but the situations should be communicative in nature and motivate students to learn more about the target culture for communicative reasons. All videos should be done in the target language.