As you progress, you will see where you have too many or not enough events, and when you might need to have planning and business meetings in order to achieve the social and philanthropic aims. Your executive board will also be able to schedule their meetings in and around other events. Once you have the plan decided - write the dates in your own planner/phone/calendar and circulate a list. That way you are less likely to double book yourself, and more likely to have high attendance at all sorority meetings.
As a chapter, it helps to know where you are going - and how you plan on getting there.