As Celebrant-led ceremonies are all bespoke it is possible to include all the people you wish to be included. Friends and family can be involved by reading poems or performing songs.
You may also wish children from previous partnerships to be included and acknowledge the new roles and relationships that have been created.
Where numbers permit you can also involve everyone using a symbolic action; within a Naming or Welcoming ceremony the invited guests may form a circle of support around the parents and child and Ring warming is a good way to include guests when undertaking a Wedding or Commitment ceremony.
And don't forget the role your dog might take - bridesmaid's escort or ring bearer.
Choosing a Celebrant to help you create that special ceremony is an important step towards making your occasion a really memorable one. Why not take advantage of the free initial meeting I offer ? I believe it is important to meet informally to discuss your ideas and what I can offer. Meeting also gives us an opportunity to explore the type of ceremony that would best suit your needs.