[anticorporate]

I've always enjoyed the dedicated hardware track at All Things Open (Raleigh, NC, USA, October). They also partner with an organization called RIoT that has a lot of resources for startups and typically do a demo night, among other things.

https://riot.org/event/riot-iot-demo-night-2023/

https://2023.allthingsopen.org/schedule/

It's not exactly what you're looking for, but it's a great opportunity to network with other people in this space.