I know this is really really short but I think this a good head canon. You decide. You can love it or you can hate it. Anyway. Here it is:
When Peeta and Katniss got married, she carried a bouquet of primroses. Finnick Junior was pageboy, and they had specially invited Rue's younger sisters to be bridesmaids. The dancing and celebrations had carried on all night, led by Greasy Sae, and Katniss couldn't remember a time when she felt so weightless, so free. Still, her favourite part of the day was when Haymitch gave her away. As they reached the alter, Haymitch said quietly, "You know that one time when I told you to live a thousand lifetimes before you'd deserve Peeta? I was wrong, sweetheart. You deserve each other"