It would be beautiful to start the sermon with a description of a wedding. It is a big party, which you celebrate exuberantly. Fasting is not part of it.
From there you can describe what it was like in Israel when Jesus appeared there. He came to save sinners and restore life. He was the great bridegroom. Fasting is not fitting during this period.
The core of the sermon may be the focus on our lives today. We live in a time after Good Friday and Easter. The bridegroom has been on earth to get his bride, and he will come back for the wedding. In the meantime, we live, preparing for his return.
This means living with a desire, but also with the realization that we do not have to deal with everything. You may live simply; you may seek silence to pray, to be with God. This is how your longing for Jesus’ coming will be nurtured. Fasting today means living modestly and humbly.
The best part is that the bridegroom longs for us! He loves us so much that he wants to have us with him forever. This makes our lives beautiful and rich. He desires us even more than we desire him!
18 Now John’s disciples and the Pharisees were fasting. And people came and said to him, “Why do John’s disciples and the disciples of the Pharisees fast, but your disciples do not fast?”