Target Audience

For my event to be successful i need to consider my target audience and what kind of people are likely to attend my event.Obviously the event is quite new and modern so older people such as 50+ will not be interested in my event.I want an audience who like to 'party' so a younger audience is maybe more acceptable.People from the age group 18 - 30.However not all people in that specific age group are the same so i need to find a specific type of person to suit my event.