Govardhan Pooja commemorates the incident when Lord Krishna lifted the entire Govardhan Hill to provide shelter to all the villagers of Vrindavan. They were affected by severe torrential rains.
This day has greater significance than we know. Make this an awesome Bhai dooj for yourself and for your sister and try to create a stronger bond than before by celebrating this day with much more happiness.
If you wanted to celebrate this Narak Chaturdashi in the southern custom you can get the information about it here and if you want to celebrate it in northern custom ways you can also go for that.
Diwali in India is always very special to people of all walks of life. Most people organize parties and have a gala time with friends and family. Professional people have office parties and celebrate in style.