We are having our ceremony and reception in public areas. Our ceremony will be on the beach, not worried about this part, but our reception will be held at a museum with a public resturant attached. There is one main entrance that leads to both the museum and the restuarant. There is a side entrance that leads to the museum after walking through the steps and patio. Our cocktail hour is on the patio with maybe an ability to use ropes? Our reception will be held inside the museum. How do we keep wedding crashers or uninvited guests out of our reception? We will know every person that will be there, no unmet family members, but we have 160 guests. We wont be to pay attention to the entire crowd. Our guests are from many aspects of our lives so there are also not many people that would know everyone. Our only really option is stopping them from getting in. Any suggestions?