Hello Nitin,
Firstly make plan what event is all about.Get images created for event.Once you are done with that,create a facebook event specifying the details of the event.Create a buzz before the event with interesting posting.Advertise smartly on Facebook.Take help of facebook ads to increase your event reach and make it viral.Give enough time and allocate resource to achieve desired result.
I hope this will surely help you.
Regards
Jaishri Khandre