Step one to be taken is to find a beach, park or garden that is beaming with life. You will need to do this because it will bring out the wonderful features of summer. You will need to carefully avoid planning for the months that do not traditionally have summer weather.
The 2nd step is to plan on casual attire being worn in the wedding ceremony. What you should do here is plan on clothing that will be cool and semi-formal to drive home the breeziness of summer.
The 3rd step will be to plan a reception menu that features food like barbecue and seafood. This is really very important because it is the food that people generally associate with the summer months. What is important to avoid will be having food that is too difficult to eat without too many utensils.