The Week Ahead: County Fair; Tai Chi Fundamentals

• In Bronxville, there will be a Tai Chi Fundamentals Forms class at West Center Congregational Church from 5:30 p.m. until 6:30 p.m. on Tuesday.

• The Friends of the Scarsdale Public Library Annual Book Sale Friends Preview will run from 7 p.m. until 9 p.m. on Thursday.

• In Scarsdale on Tuesday, the Greenburgh Nature Center will be holding its Kids Day of Service. Kids can volunteer to clean up the nature center's trails from 1 p.m. until 3 p.m.

• On Monday, there will be a bird walk held at Muscoot Farm. The walk, which is free, starts at 7:30 a.m.

• In Scarsdale, The Greenburgh Nature Center will be holding its Outdoor Yoga session from 9 a.m. until 10 a.m. on Friday. Classes are $20.

• On Saturday, head up to Westchester's only real County Fair, The Yorktown Grange Fair. It's at 99 Moseman Road in Yorktown Heights. The fair runs all day.