It wouldn't be summer without big family parties under the shelter at the park. Write all about it in this book designed expressly for that purpose.
Write about current picnics, then go back in time and write about earlier ones. Go farther back in time and write the earliest memories you have of family gatherings held in the open air.
Keeping a running account of who brought what, will help you not duplicate the next time. Write down your favorite recipes as well as new ones you want to try. Write about quantity cooking and transporting. What traditional picnic foods are guaranteed to satisfy a crowd? What did you wear, how was the weather? What essentials do you always bring?
Writing extends the fun, and the memories are there the minute you open and write in this lovely book.