Who would have thought that with all the Ubers, cyclists and motorists filling City streets there would be any space for a dance festival? But that is exactly what is happening this Saturday and Sunday at the San Francisco Trolley Dances. For a $1 senior Muni pass hop on and off buses to see a free modern dance festival with some of the most adventurous troupes in town kicking up their heels. The 8 tours start at 10am at the Eureka Valley Branch Library and last a couple of hours. Tickets are first come, first serve and go fast.