Any informal meal eaten outside or on an excursion WordNet 3.0 & Open English WordNet

A picnic is a meal taken outdoors as part of an excursion, especially in scenic surroundings, such as a park, lakeside, or other place affording an interesting view, or else in conjunction with a public event such as preceding an open-air theater performance, and usually in summer or spring. Wikipedia

Meal eaten outside. Wikipedia Disambiguation