Response: The blessing of your marriage by the church is a vow renewal, since you are already legally married. Because of your age and the number of years that you have been married, it would be inappropriate to wear a traditional wedding dress and a veil, though you can certainly wear a white dress, just not a wedding dress, and no veil.
As for gifts, guests do not generally give gifts for a vow renewal ceremony. Even if they did, it is considered poor manners to mention gifts in an invitation. The way to make your wishes known is to tell people when they ask, but only if they ask. Since most people wont give gifts, those who ask are the ones who will be considering giving something.
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