Well, I know you want to date an INFP in general and not me in special, but I find you won't find me on any of the noted places; the problem is it is difficult to find me at public places at all. I heard from some other INFPs here they are similar in that way, so maybe I can still contribute a bit to the understanding, or so I hope at least.
My situation is that I don't know where to go alone in a public place, since I feel awkward going to somewhere alone and just sit there alone. And I am not the person who engages random strangers either. The problem is, if you don't want to go somewhere alone, you need to know people who go with you somewhere, and to get to know people somewhere you have to go out alone somewhere and engage with random strangers! Sounds probably kinda stupid, I know, but I am still thinking for myself what I could do to get to know people, and so I am thinking about somehow getting some kind of public hobby or something of that sort. And so while I am an INFP, funnily I look somehow like you a place where INFPs could go to - not to find some INFP to date (or maybe I do? ^^), but to find some place for myself to be actually! Since I realize it gets hard stopping to be lonely if you are only private all the time
The point is as I said that I heard from other INFPs here they have the same issue. And that is maybe why we (or at least some of us) are so difficult to get caught by other people like you.
So I find the thread interesting because I might find some inspiration where other INFPs might be found at.