There's no TeX Hour tonight because the 2021 TeX Conference has already started. There'll be an accessibility TeX Hour next week. The topic will be technical obstacles to Accessible TeX. It will be informed by 8 talks at the TeX Conference.

Zoom details for next TeX Hour

Date and time: Thursday 12 August, 6.30 to 7.30pm UK time.
UK time now: https://time.is/UK.
Zoom URL: https://us02web.zoom.us/j/78551255396?pwd=cHdJN0pTTXRlRCtSd1lCTHpuWmNIUT09
Meeting ID: 785 5125 5396
Passcode: knuth

TeX Conference and accessibility talks

You'll find live streams from the TeX Conference at https://www.youtube.com/c/TeXUsersGroup. From 11:00am to 14:00pm tomorrow (UK time) there'll be 4 talks on math accessibility, and another 4 talks from 20:30pm tomorrow to 0:45am the next day (UK time).

For more details see https://tug.org/tug2021/sched.html, which helpfully gives the talk times in your current local time.

with best regards