Usually the answer is no.
A wedding is such this specifically defined event in most people's minds that I find couples need 'permission' to go off script.
They need me as they're planner to help them realize they can call the shots and make the wedding exactly what they wanted to be. For example, it is okay if they don't want to have a garter toss.
Most of the couples I work with are extremely thoughtful, and want to create a great experience for all their guest, but they need help figuring out how to make it more meaningful and enjoyable for themselves.