Cobb Semi-annual Book Sale. 9 a.m. to 5 p.m. today, 1-5 p.m. Sunday. Cobb Civic Center, 548 S. Marietta Parkway SE, Marietta. Only cash and checks will be accepted. Sunday is BYOB (Bring Your Own Box) Day — any size box and fill it to the top. All profits from this sale go to buy more items for the 17 libraries in the Cobb County Public Library System. Jonathan McKeown at 770-528-2332 or email@example.com. facebook. com/events/718810205118805
Smyrna Streets Alive. 2-6 p.m. Sunday. Free. Downtown Smyrna. Hosted by residents from the Community Health Advisory Council and the Smyrna United Task Force, this event is modeled on the Atlanta Streets Alive events. Near downtown, 1.3 miles of streets will be closed to vehicles so that residents may walk and ride bikes. Activities will be planned at various spots.