I'm trying to figure out what kind of "event" Open Sauce would call itself. My impression is that it's a mix between a maker conference and science fair. It's an annual event and this year, it's taking place at San Mateo County Event Center from July 18-20. The first day was limited to "industry", so today was the first day it was open to the public.

On the official website, they don't really say much about what Open Sauce is:

A FESTIVAL OF MAKERS AND CREATORS

Join Us at the 3rd Annual Open Sauce Live!

Get ready to experience three days of mad science experiments, new technology, and a full-on celebration of makers and creators.

They link to some articles about the event like this 2024 article from tubefilter which calls Open Sauce a STEM convention for content creators, engineers, and fans of science.