I know you have already said you are going to the wedding, but here is my advice for you as one older woman to a younger:

Assume that if you were invited somewhere, you are wanted there. I know it is easy to worry 'but am I really wanted, is this a pity invite or just a formal thing?' Etc.

But those happen very rarely. More often than not, if someone doesn't want you at a thing, they won't invite you. They'll find some excuse if it is expected.

And if it was a pity invite? Go and assume you are wanted. If it is the rare pity invite, going and assuming you are wanted and acting like it will generally have a better net outcome in your life than not going or going and worrying the whole time about whether you are or aren't wanted there.