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Generally the hosts would pay for the costs of the event but if it is a golf outing where everyone should pay for their own green fees or if there are costs that need to be shared such as spa fees then everyone should pay for their own and somone or a few of the people should help pay for the guest of honor.
The best way to spread this information is by word of mouth so you can explain what the costs are designated for.
You can note costs for a bachelor/bachelorette party, where guests will split the costs of the party (such as limo, spa services, golf, etc.) on the bottom right hand corner of the invitation in smaller letters. You should note what the costs are for so guests know if they need to bring more money or if that will cover their entertainment for the entire event.