With the writers’ strike in week 10, SAG-AFTRA actors are walking off the job at Friday 12 a.m. What does this mean for workers, studios, and media consumers? Three art shows to check out this summer: “Wishing Well” supports research for a rare genetic disorder; “Variations on a Theme” shows different rules artists employ in their craft; “20” celebrates the 20th anniversary of David Kordansky Gallery.