I'm really struggling to see what concerns anybody could have about this.
Are all-male groups not allowed to arrange to get together and just enjoy themselves?
There's likely also a Reggae festival being organised right now for this Summer, somewhere in Jamaica. I'm not a Reggae fan and I don't live anywhere near Jamaica, so I wouldn't dream of going - but I don't have the slightest objection whatsoever against those who are planning to attend.
YABU - it's not always about you.