Yeah, there are definitely organizations that have men's groups – churches, community centers, etc. – that can be very good in a number of ways, but the benefits they have don't seem to me to be work-related (though I could be wrong – as a cis woman, I've never been in a "men's group"). It's also very much worth noting that this isn't a men's group, it's a men's event, and that seems ickier to me, since it (presumably) is less about social/emotional support and more about networking/work tips, and I don't see a benefit to excluding other genders from that.