Merge pull request #282 from gristlabs/webinar-date-fix

correct webinar date

help/newsletters/2023-10.md

@@ -214,7 +214,7 @@ Working on something cool with Grist? Let us know by posting in the [Showcase fo
 
 In November, we'll learn how to summarize and analyze data in charts and summary tables, with tips and tricks to get more out of summary tables.
 
-**Thursday November 20th at 3:00pm US Eastern Time.**
+**Monday November 20th at 3:00pm US Eastern Time.**
 
 [SIGN UP FOR NOVEMBER'S WEBINAR](https://www.getgrist.com/webinars/charts-view-and-summary-tables-webinar/?utm_source=support-newsletter&utm_medium=internal&utm_campaign=build-webinar&utm_term=november-2023){:target="\_blank"}
 {: .grist-button}