A surprise birthday party is an exciting event, full of mysteries and anticipation as you see the party slowly begin to take form. But how can you plan a party without the star of the show? Read our guide below for some useful tips and get started on planning an unforgettable event.   Get some friends involved The first step to planning a successful surprise birthday party is to gather some family and friends who can lend a hand. Trying to undertake this task alone will easily overwhelm you, which is why we recommend getting a few others to help spread the weight. By sharing ideas..