Whitsunday Regency Picnic.
It's the 7th Sunday after Easter, and traditionally the start of a week of holiday for medieval England. Elsewhere this Sunday was known as Pentecost.
Britannia Antiquity, May 19th.

Spring Whitsunday Regency Picnic.
Britannia Antiquity

“To picnic is to consume not only particular food, but also a specific environment chosen according to an aesthetic standard, and a particular form of sharing food according to certain standards of behavior. It means creating a moveable feast and overcoming difficulties and inconveniences, not only for preparation and transportation, but also for consumption and cleanup. Yet picnicking is the pleasurable pursuit of a leisured people, so the difficulty of moving the feast has some reward. The reward is primarily ideological: it enables the participant to share a form of eating that creates relationships between small groups of people, natural landmarks, and cultural ideals. These relationships form a consciousness of national identity. Picnicking, especially for early nineteenth-century picnickers, was thus away of performing Britishness.”…… How Wordsworth Invented Picnicking and Saved British Culture*: Andrew Hubbell