Introductory trial session for the Advanced Hebrew Course at Ulpan Adi, Sundays and Thursdays 5:30–7:00 PM.
A guess
A morning: a focused but friendly mood, where you meet people through the topic. Probably curious people, easy to start talking with. In Tel Aviv people mostly go out in groups of friends, and most are locals.
A guess from the kind of event, the hour and the city, not from the organizer.