If you broke up with your partner and you were both invited to a party, what would you do?

If you broke up with your partner and you were both invited to a party, what would you do?
Would you go? Would you go only if your ex didn't come? Or would you go and ignore them?

Don't worry, this is not my case. Or better - it's the case of a couple of friends who I invited to a very important event next week. Far from me to meddle in other people's private lives, but since it's a very important event and the spots are counted due to Covid, I had to reach them out to learn about what they intended to do.
Apparently the break up is mutual and amicable, so they'll both come without issue, although she was a bit annoyed the guy told me because she wanted to keep it hush until after the event to "not ruin it".
I reassured her they didn't ruin anything and to not worry.
If you broke up with your partner and you were both invited to a party, what would you do?
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