Well, I took a look at the skating and ice rinks and they have lights and sound attached. If you made the rink invisible, whether by replacing the meshes with empty meshes or whether by enabling alpha transparency and using a texture with an alpha channel for your invisible swatch (which, at first glance, would be likely the best method if you want both a visible and invisible swatch) there is still the issue of the light source and speakers for the music. If you made the rink invisible you would have a light source just sort of hanging out, phantom-like. You could perhaps edit the light source so that it's so small it's almost invisible. I haven't done this myself but here's an excellent discussion on how to edit a light source: https://sims4studio.com/thread/1451/light-source-solved?page=2&scrollTo=21199 You could even try removing the light source altogether but I have no idea whether doing so would bork things. Generally, I think it's not a good idea to delete things. As for the speakers, wouldn't you need to have something visible so that you can click on it in order to turn on/off the music and/or change the music? That issue would require some thought...and likely some outside help. If I were you I'd post your question at Sims4Studio.com. They are wonderful over there.
Edit: Looks like you can actually remove a light source from something. The tutorial is here: https://sims4studio.com/thread/882/mini-tutorial-remove-light-lamp?page=1
