This is a very common fundraising tactic for all sorts of organizations — and it’s usually in their script that they don’t say that they’re seeking donations right off the bat, but ask for “a few minutes of your time” or “to talk.” It sounds like they were going a bit late into the evening, but other than that nothing about this really strikes me as sketchy. If you don’t want this to happen again, you can hang up a “no solicitors” sign or something similar on your front door. Might be worth keeping an open mind about this an an aspect of city living though—I’ve had some great conversations with various orgs that have come to my door to talk about things that I care about in the community!