Wedding and babysitter

Hi , I have a wedding coming up and I'm nervous as children aren't invited so I can't bring my 3 year old. We haven't left her alone with any1 before and now that it's coming up I'm dreading it. Even leaving with my parents I just haven't done so and worry cos whenever she thought I might leave her she cries and says "what about Me.. I don't want to miss out etc" she's very attached me to me