One of the principal reasons for public wedding ceremonies is to build community support for your marriage. Marriages do better when rooted in community.
Your Wedding Vows are one way to engage your community. When you tell your community what you are going to do together, you give them something to support.
You can also envision your marriage firmly within your community as part of your vows. This will also encourage people to support you as they understand your desire and determination to be engaged in your community.
Tip: People long to be connected. Your inviting people to your wedding tells them that you want to be connected with them. Sharing your most dearly held dreams, for the success of your loving relationship and your new family, allows them to understand how to support and to celebrate with you. This is what you want!