I have not because most of them are paid and the free ones can be attended through a webinar but in the end, there's always the sales pitch from the organizers. That's why if it's about these kinds of mentorships in the web3 for young individuals, if it's not bothering you then go ahead. While you are young, explore more because you have a lot of time and even if failures meet you, you have ample time to recover from those failures that soon will become your lessons.