What does lord capulet stop tybalt from doing at the feast?

Lord capulet stops Tybalt from attacking Romeo and causing him trouble because Lord Capulet does not want any more trouble, and he thinks that Romeo is basically just a lovestruck boy that is quite curious, and because he's not doing anything particularly bad at the moment, he should just be left alone. lord Capulet does not want the feast ruined.

Lord Capulet tells Tybalt to not fight there at the party and to ignore Romeo because Lord Capulet wills Tybalt to do so