Question

should there be a comma before the highlighted word?
unless sokka brings more chalk, the hopscotch tournament will have to be postponed.
keep the comma remove the comma

Explanation:

The sentence starts with a subordinate clause ("Unless Sokka brings more chalk") followed by the main clause ("the hopscotch tournament will have to be postponed"). When a subordinate clause comes before the main clause, a comma is used to separate them. So the comma should be kept.

Answer:

Keep the Comma