This post is a particularly difficult post to maintain, as the dates of key events are changing every year. Furthermore, each different teacher may impose different deadlines on their own will, making this post harder to maintain.
Some resources on IB key event deadlines (For Grad 2021)
The above link provides key deadlines about CAS and Extended Essay.
Mock Exams and Predicted Grade: Jan 2021
Final Exams: May 2021
Physics and Chemistry HL
IA Draft: Oct 2021
IA Final Copy Deadline: Dec 2021
IOC: March 2021
IA Draft: Feb 2021
IA Final Copy: March 2021