Detail Friar Lawrence's plan

 Basically Friar Lawrence gets Romeo to skip town to Mantua where he will wait for a message from Friar. Juliet will drink he sleep potion. Her family, thinking her dead, will put her in Capulet tomb. Romeo will return to the tomb, as per instructions. He will see his Juliet and she will wake. Both families will be so happy that the feud would end and R &J can live happily ever after.