Visa requirement for attending Fab Academy in a US-based Fab Lab


I’m wondering if anyone has attended Fab Academy at a US-based Fab Lab on a B1/B2 visitor visa? Is it legal to do so on this visa category? If not, please suggest appropriate visa category(/ies) to do so. From what I have gathered, it seems you can because its a non-academic course (meaning one doesn’t get college or university credits for it), but I’m not sure. For some reasons, I have to be in the US for some time starting the beginning of next year, and I would also like to complete Fab Academy in the 2019 cycle, and so my question. Please advise. Thanks.