1 Juliet and Romeo met in the cell
Romeo and Juliet met in the Fiar Lawrence's cell. Fiar Lawrence was the kind character who helped Romeo and Juliet to get married secretly.
2 Both are happy
They both were in high spirits about the step they were about to take. (See Summary of Romeo and Juliet – Act 1 Scene 5)
3 Fiar Lawrence gets them married
For getting to see this, how Fiar Lawrence helped them to get married, you need to see Summary of Act 3- Scene 1. (See Summary of Romeo and Juliet – Act 3 Scene 5)