What helps
- Introduce her as a friend — true on the day
- Agree how you met in a sentence
- Plan the moments that matter: arrival, the ceremony, the toast
- Agree when you leave, before the evening gets long
What to avoid
- Inventing a relationship that will be asked about later
- Staging anything for an ex's benefit
- Asking her to act romantically — that is never part of the service

Why it works
Arriving with someone easy to be with changes the day: you have a conversation to return to, someone at your side for the photographs, and a reason to enjoy yourself.
Frequently asked questions
Will she pretend we are together?
No. She follows the introduction you agree inside the platonic rules; "a friend" works best.
What if my ex asks about her?
Use the answer in your brief: simple, friendly, close to true.
Is this petty?
Not if the aim is to enjoy the day. Going with someone is ordinary; making a show is what to avoid.
