You don't say the purpose of meeting the strangers but in a general sense I do it by placing myself in situations of shared similar interests. Doing this means that questions feel less like an interrogation because everyone is there for a similar purpose.
I've tried leaving out the questions. Observations work about as well. "This meeting is certainly lasting a long time", "I've never met so-and-so...", "What a nice venue for a get-together!" and so on. I can certainly see how conversations could work without constantly prompting your partner for content.
That's why I love organizing Meetups. :).
If it's someone I've anticipated meeting, I might do the same but with more than just casual enthusiasm.
This is really just the tip of the iceberg :)
“What’s your favorite color?”