We celebrated dd's first birthday some days ago with our families.
My own mother was such a joy to be with on that day. She can be a great entertainer, incredibly charming and funny. She was on a party until 3am in the morning the night before (and my mom is in her early 60ies, haha), dancing and having a good time.
On our way home, I texted her how much we enjoyed her presence. She said she needs to party more often because it makes her so relaxed.
I believe it's a great way to "let it all out", all the excess energy. Ever noticed how nothing can really bother or annoy you after a really good night out?