TL in Genius Hour/20 Time

I'm having an interesting conversation on Twitter with a few other foreign language teachers about how to use the TL (Target Language) during these times.  I feel very strongly that students should have the freedom to explore and present their passions without being hindered by having to do it in a second language (yes, that even includes higher levels - I would die if all the things I wanted to learn about and/or present I had to do so in Spanish).  So, the core of Genius Hour/20Time really needs to be done without having to use the language.

However, we are generating ideas for other ways of integrating foreign language.

• Obviously, part of mine is the requirement to connect at least part of their learning to other cultures. (I just had a related idea - rather than making that culture a focus of a project, students could do a sort of mini-project as part of their genius hour to find out ways their topic connects to Spanish-speaking culture).
• Since their passions will include some essential vocabulary and terminology (like the word "input" in education), students could make a vocabulary list of the essential vocabulary for their topic and how those translate into Spanish.  Should they decide to pursue their passions and need to communicate about them in Spanish, these words will be critical to them.