What could the "flying saucer"-shaped object located on a mountaintop in Southern CA be?

[jarlrmai]

My thought was maybe a trail running event and the gazebo was for drinks/rest/officials.

 

[jarlrmai]

Hmm the date puts it during covid though.

 

[Matt33]

One thing I learned while searching for UFOs on Minefee trails is that Google Earth projects lines, paths and circles into Street View images. That was new to me.