Doctor Popular writes:

Today is 24 Hour Comic Book Day, meaning artists all over the world will be attempting to write and draw their own 24 page comics in 24 consecutive hours. Nearly 40 artists will be attempting the challenge in San Francisco and we’ll be live broadcasting the entire time… if you like watching people drawing.

To learn more about 24hcbd check out 24hourcomicsday.com.
Each SF location will have it’s own stream, you can see them embedded on blog.missioncomicsandart.com and comicoutpost.blogspot.com