Question

Why are the Socs and greasers going to fight in the vacant lot?
The outsiders ch5

Answer 1

Because the socs want to avenge their buddy bob because he got killed and the greasers wanted to avenge their buddy johnny because he died because he and ponyboy had to run away to hide from the police for killing bob.

Step-by-step explanation:

I read the book.

Answer 2

An opportunity to seek vengeance on their friends behalf; the socs wanted to avenge Bob's death, and the greasers wanted to settle the score for Johnny.

Also, the lot is a less conspicuous place where they hoped cops would not break up the fight. Moreover, the lot is convenient for the greasers in terms of location because it's their neighborhood.