Hello, All Week I Have Been Planning For This Holiday

Hello,
All week I have been planning for this holiday brunch. I was working so getting everything done was a challenge and every night I went to bed exhausted. Today was the day of the brunch all went well. After everyone left I started to reflect on the brunch and got sad. I cant figure out what I feel this way. No one fought, I only had to reprimand one niece and all got along. What's wrong with me?