Calendar
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 7:00: December Thursday Night Swiss | 10am: December Quads | |||||
| 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 7:00: December Thursday Night Swiss | 10am: Holiday Open | |||||
| 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| 10am: Milestones Sunday | 7:00: December Thursday Night Swiss | 10am: Greg Hager Memorial | ||||
| 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| 4:15pm: Open House: Unrated for Rated Players 10:30am: December Scholastic Grand Prix |
7:15pm: Open House: Unrated Play UP December School Break Program |
December School Break Program | December School Break Program 7:00: December Thursday Night Swiss |
December School Break Program | 10am: Last Centennial Quads of 2019 | |
| 29 | 30 | 31 | 1 | 2 | 3 | 4 |
| GM Larry Christiansen - Intensive Two Day Clinic | GM Larry Christiansen - Intensive Two Day Clinic | 11:45am: Herb Healy | 7pm: January Thursday Night Swiss | No event in view of Boston Chess Congress |