I am sure a lot of people are wondering what other people are doing about performances as you plan for the day you can actually start again. Classicfm.com shared a number of images and videos of the way different venues have been spacing both musicians and audiences.
To me the most novel idea and location was a cello concert at the bottom of an empty pool in Germany. Are the acoustics of a pool conducive to the cello range? There is another article with more pictures from other angles. The lane markers made for good spacing guides and the grade of the floor as it moved toward the shallow end helped with sightlines.
In Hong Kong, they had plexiglass between orchestra members, but in The Netherlands, they had empty seats and dividers to separate audience members.
There are a number of pictures of people arrayed in seating at social distance which may strike many as a bit depressing given the appearance of sparse attendance.
One image I found very striking was that of the London Mozart Players performing in a church. While there was no audience because they were video taping, when I saw all the musicians wearing vibrant red facemasks and bits of red clothing, my first thought was that they really made it work even spaced apart. Granted, some of that is due to good audio and video editing and the ability to zoom in close to the musicians, but for most of the video it is pretty clear everyone is spaced further apart than usual.