You have set your budget and worked out your timeline down to the last detail, but one thing you might have forgotten to plan was your event insurance.  While most venues do require proof of event insurance, some couples sign the contract and then realize they never looked into the insurance policy until right before their event.  

Planning ahead can save you time and often save you money because you won't be scrambling to find a policy that supplies adequate coverage.  (In most cases, up to $1M for the day of the event.)