Okay - my one cause for celebration right now would be the Summer Solstice.
I've never been a fan of summertime here in Southern California. We have 100 + days, sometimes high in humidity throughout August.
So we'll celebrate the great things about summer this Friday. Going to the beach. Air conditioning in our home. Reading more. Lots and lots of reading

. Sitting outside in the evenings. Getting up early and enjoying the first of the day before it warms up.
As for how might I begin living a life of celebration? I think I want to start having a one night where when we have our family dinner, we each talk about one accomplishment for that week. Then we'll have a special dessert. I'd also like to do more picnics up in the mountains.