“If you organize it then obviously you will be up late at night, drinking, with other men.”
That’s not really a fair assumption.
DH’s job–one in a professional, corporate environment–has work happy hours as a standard Social Thing that new hires in particular are encouraged/expected to attend. Spouses/significant others are welcome also; pre-kid, and when DH was a bit newer to the company, I often attended with him when he’d go. (Neither of us do now, but that’s a function of having kids plus his being with the company for some time now.) These things started at about 5:30, had generally wrapped up by 7:30, and I never saw anything even remotely approaching inappropriate behavior at any of them. Most people would have a beer, perhaps two; some wouldn’t drink at all, and no one cared either way, but no one ever got so much as tipsy that I could see, and I’ve got a pretty good nose for such things. We’d nibble on company-provided appetizers, discuss various things…and that was it.
For someone to refuse to attend such a thing because there are people of the opposite sex there would be quite silly. It was a good way for the various newish-to-the-company people to get to know one another in a more relaxed environment, and one with known, acceptable standards of behavior. For the record, I wouldn’t be comfortable with DH going out to dinner/drinks with a female colleague alone (and neither would he), but I never cared at all if he wanted to go to this kind of thing, whether or not I attended.