The night Mars reaches opposition, December 7/8, 2022, the full Moon will occult Mars. The occultation will be visible from all of North America, except the southeast. (It will be visible from where I live, near Schenectady, NY, but not from southern NY state. It looks the area around Saugerties, NY, will see a graze.)
It looks like those in parts of the San Antonio, TX, area will have a deep graze and much south of there will miss it. Use your planetarium app to see what happens where you live.
Mars will appear 17 arcseconds in diameter.
Clear skies, Alan