Things that require a chapter vote: Changing the bylaws Offering a bid to potential members Revoking membership Electing officers Setting the budget Changing the budget
Things that do not require a chapter vote:
Selecting T-shirt color Violating a policy Holding an event Scheduling an event Deciding the new member program Picking a Greek Week partner Sending an email or note card Creating an advertisement Participating in homecoming
Don't confuse agreement with authority. Getting the support of your members is important, but letting them make all the decisions isn't necessary.
Your members were looking for someone to step up, show some courage, and set the course for the future. They elected you. You have their approval. They're just waiting for you to realize it. Now make a decision and get to work.