Flight
O'Hare Airport is definitely the easiest for international and domestic flights. A brief taxi or Uber ride can transport you to the wedding venue or downtown Chicago.
Hotel
This hotel is directly next to the wedding & reception venue (and not much else).
Hotel
This economy hotel is the cheapest option for July 4 weekend. If you're looking for amazing views of downtown and the Chicago River, these are some pricier options: Swissotel, LondonHouse Curio Collection, Hyatt Regency Chicago.