Why does Paris visit Friar Lawrence?
As was mentioned in the previous post, Paris visits Friar Lawrence's cell in Act Four, Scene 1 to discuss and set up his upcoming wedding with Juliet. When Paris arrives at Friar Lawrence's cell, he mentions that Lord Capulet is in a hurry because Juliet has been extremely depressed as of late. Juliet's father believes that the sooner she is married to Paris, the quicker she will be able to get over the death of her cousin. Ironically, Juliet arrives at Friar Lawrence's cell to discuss how to avoid marrying Paris shortly after he speaks about their upcoming wedding. At this moment in the play, both Lord Capulet and Paris are unaware that Juliet has already married Romeo. Paris innocently is concerned about Juliet and truly cares about her. Friar Lawrence ends up giving Juliet a sleeping potion and she successfully avoids marrying Paris.
The only time Paris calls on Friar Lawrence is in Act IV, scene i to plan his wedding. Paris is hasty in his effort as Lord Capulet has encouraged this marriage to happen quickly because Juliet is so depressed. But Capulet has no concept of her depression. He thinks it has to do with Tybalt's death when in reality it has to do with Romeo's absence and is complicated and intensified by this forced marriage to Paris.
Juliet interrupts Paris' effort to make plans with the Friar. This is the point at which she seeks the Friar out for help to remedy this planned marriage. It's a little ironic that Paris is there to start their marriage and Juliet arrives to end it before it happens.
Paris goes to talk to Friar Laurence in Scene 1 of Act IV. The reason that he is going to talk to the friar is because the friar is supposed to marry Paris to Juliet in just a few days.
Paris is presumably there to make plans about the wedding. Friar Laurence is kind of reluctant to do this because he knows that Juliet is married to Romeo. Before long, Juliet comes to make her confession and so there is no opportunity for Paris and the friar to do any planning.