I've been in Spain for three NBA finals, and all three times, the games were carried LIVE on TVE-2. In the "old" days, there used to be the NBA game of the week...the show was called "Cerca de las Estrellas" (Close to the stars), but now, the NBA is a little more popular than even then, which is why you'll catch things live.
You'll have to do the math, since LIVE means about 2:00 a.m. Spain time. We never went to a bar to catch the game...we usually met at someone's home to do it. I would simply ask around your neighborhood where you'll be and see about who's open, etc. You may get lucky on the times, though, since Sunday games are usually early-afternoon.
By the way...Go Lakers.