Top 3 Resources for the upcoming Lightning Critical Update:

1. Please review the attached presentation.

2. The comprehensive FAQs with resources (https://help.salesforce.com/articleView?id=000317946&type=1&mode=1).

3. Trust will show the winter release maintenance schedule for your instance. (https://status.salesforce.com/products/all). Search for and click on the Instance. Once on the particular instance page, click the maintenance tab to view your 

Winter '20 Major Release date. 

Please let me know if there are any questions, comments or concerns.