Check out some of the plazas below. While you look at the photos, notice what people are doing in the plazas.
A small plaza within el Parque del Buen Retiro
The main plaza in Madrid - Puerta del Sol
La Plaza del Dos de mayo
Dosde Market (el mercado del diseno) in Plaza del Dos de mayo where the Spaniards sell handmade crafts/jewelry
Plaza de Oriente - right in front of the Palacio Real
Plaza Mayor - the other main plaza in Madrid
Plaza de Santa Ana - the smaller plaza two blocks from my apartment
So what did you notice the people doing? I saw people: hanging out and chatting with friends, walking dogs, eating at cafes, talking on the phone, eating ice cream or other snacks, riding bikes, walking around, and more!
I'm sure I will upload more photos of plazas as I encounter more and more each day :)