Final answer:
The irony in Friar Lawrence's consolation is that he is responsible for the deaths of Romeo and Juliet, while the irony in the change in wedding feast plans is that it turns into a tragic mourning instead of a joyful celebration.
Step-by-step explanation:
The irony in Friar Lawrence's consolation to the grieving parents is that he tries to comfort them, but he is ultimately the one responsible for the deaths of their children, Romeo and Juliet. This creates a sense of dramatic irony because the audience knows the truth, but the characters do not.
The irony in the change in wedding feast plans is that what was supposed to be a joyous celebration turns into a tragic mourning. Instead of a happy wedding, there is death and grief. This is an example of situational irony, as the outcome is the opposite of what was expected or intended.