[PYT-642] links fix

Author: arielmoguillansky

_events/pytorch_developer_day.md

@@ -7,8 +7,8 @@ header-image: assets/images/pytorch_developer_day_2021.png
 
 The PyTorch Developer Day is a virtual event that brings together leading researchers and developers from the Machine Learning (ML) community to join a multiple set of talks covering new software releases, ways PyTorch is being used in academia and industry, and current trends in ML development. Find all the talks below:
 
-- [Keynotes](https://www.youtube.com/watch?v=7yQ4FgtYvj8): Learn about the innovations, the new features, updates, and release of PyTorch, and how industries are using it for production and deployment.
+- [Keynotes](https://www.youtube.com/c/PyTorch/playlists?view=50&sort=dd&shelf_id=4): Learn about the innovations, the new features, updates, and release of PyTorch, and how industries are using it for production and deployment.
 
-- [Fireside Chat](https://www.youtube.com/watch?v=7yQ4FgtYvj8): An informal and intimate conversation with two pioneers in the field of AI (and PyTorch) sharing their thoughts and vision for the future, commentary on top-of-mind trends they are seeing.
+- [Fireside Chat](https://youtu.be/JWdDl9Tvw6g): An informal and intimate conversation with two pioneers in the field of AI (and PyTorch) sharing their thoughts and vision for the future, commentary on top-of-mind trends they are seeing.
 
 - [Community Talks](https://www.youtube.com/watch?v=7yQ4FgtYvj8): PyTorch has grown thanks to our community. Hear from our members on the work being done with PyTorch.