In 2025, from October 15th-16th, the Design 2 Part expo was in Marlborough. This is a manufacturing expo (https://www.d2p.com/) , and they are across the US. There is a youtube channel here: https://www.youtube.com/@Design2PartTradeShows
This was a medium sized expo. Larger than PCB East, but smaller than Eastec. About the size of the Robotics Expo. Unfortunately, I was only able to attend for half of the day on the 16th, so I did not get to go through the whole expo. This was free, and I think it is worth visiting for anyone interested in DIY, Manufacturing, Making, etc.