Decide to be happy today, to live with what is yours - your family, your business, your job.
If you can't have what you like, maybe you can like what you have. Just for today, be kind, cheerful, agreeable, responsive, caring, and understanding. Be your best, dress your best, talk softly, look for the bright side of things. Praise people for what they do and don't criticize them for what they cannot do. If someone does something stupid, forgive and forget. After all, it's just for one day. Who knows, it might turn out to be a good day!
