Update README.md

Author: arbennett

README.md

@@ -22,6 +22,7 @@ The structure of this repository is roughly as follows:
 - [Weds, Sept 11 - Intro to numpy](https://arizona.zoom.us/rec/share/SSjxhOaw72J48Qzw51yEci1kg9xlapUoz_KReFOFeKxMfoaYarJWtubaHeFwc8VX.tWi04Bl1JDTqwuUX?startTime=1726074191000)
 - [Supplemental - Submitting HW2 changes to github](https://arizona.zoom.us/rec/share/ZgYi2_5p3toS5hHESsRfkOOvooZGsYIpX9Y2_Q7ukEdTTgF2yUok3nTqR_B8rMNx.pSUkBGsDKP_0keCo?startTime=1726083144000)
 - [Fri, Sept 13 - Prerecorded intro to matplotlib](https://arizona.zoom.us/rec/share/AT87Wfw933PTLt1dk2CBVOrNG65r2a3UYIYojZgFHupgK7InR4p1uNC0ju9PbZ9o.GAxBFetFdsSwIg2m?startTime=1726242791000)
+- [Fri, Sept 13 - Short in class session](https://arizona.zoom.us/rec/share/7QSVVzjvJbE4D8bopU4PTGz467zMlRi9ieweGLLPls4UPQHhN14XTgPEfOygkfLa.yChWnCM0lsG3u8Fu?startTime=1726246908000)
 
 ## Useful links
 Throughout the course we'll be amassing a lot of different resources that you can use.