I am trying to DIY as much as possible. For the ceremony music I am having my brother play guitar and my brother-in-law is performing the ceremony. It just dawned on me that with around 80 people, it will be hard to hear on the beach. Does anyone have any ideas for a mini sound system on the beach? My brother works in music so I am sure he has an amp/mic I could use, but how do you deal with power on the beach? Trying not to rent some expensive system if I can avoid it.