Regarding a club, I'll ponder on that... but as for any "meeting" with someone first met on the net, just say that. Not what you'll be doing beyond coffee or lunch, just that you're meeting someone from online. For most folk,THAT is sufficient reason for a safe-call. In my opinion, more necessary for a vanilla meet and greet than a kinky meet and greet. Vanilla posers are potentially more dangerous.
Don't forget... many predators expect you to make a safety call... so also set up the expectation of checking in hourly (or so) and have a "duress" word. Such as, if all is well, you can say that, say "good", say "great" say just about anything, except one word that means you're in trouble. "Wonderful" works. "Brilliant" perhaps if you're English. Just a word you won't accidently use if you ARE having a great time and are all excited. (I hate it when the cops burst in just as a girl is cumming.)