CHICAGO—So far, Eighth Blackbird’s attempts at live-streaming a virtual concert series from their production house in Horner Park have not gone well. The series—called Chicago Artists Workshop, or CAW for short (get it? CAW? Like a bird?)—was set to open Oct. 20 with the ensemble’s Grammy Award-winning co-founders Lisa Kaplan and Matthew Duvall accompanying tenor Karim Sulayman in a rangy program…