Never forget that the most important aspect of any event is having the right guests at your party. Making sure that the key people are available to help you in celebrating your event or party is central to the event. As soon as you know your event date, before invitations are even done, there is no harm in sending a save the date text or email, especially to the people that you really want to attend. If this is an outdoor event, then, its best to tell your guests so the ladies can consider this in their dress code and men know what is expected in terms of the menu!!