This month, the full moon will be on (Sunday 30th April and) Tuesday, 30th May. Those who play/plot with werewolves should plan accordingly.
What: Annual Potts Flower Show
Who: Laurel Potts & Daughters
Cost: n/a donations strongly encouraged for local charities
Where: Potts family home on Thimblewhit Turn and adjacent section of Padmore Park
Why: Chaos
When: May 13th, 1893
What: Wedding of Lionel Lupin & Cecilia Bulstrode
Who: Hosted by the Bulstrodes to celebrate the wedding of their daughter, Cecilia Bulstrode to Lionel Lupin. Close friends and family are invited to the wedding ceremony. *The wedding reception is open to those in the upper classes, Ministry higher-ups and any friends of the couple that are in good standing reputation-wise (8+).
Cost: N/A
Where: Bulstrode Estate, London, England
Why: Lionel is finally getting married to Cecilia Bulstrode.
When: May 20
What: Hogwarts' Annual Coming Out Ball
Who: Ball in honour of the graduating class of 1893. Also invited are graduates' families, Hogwarts faculty, students in fifth year and above, and all previous Hogwarts graduates, regardless of class.
Cost: Nope!
Where: Hogwarts Great Hall
Why: Tradition, folks.
When: 28th May
What: May Day
Who: Hosted by the Augurey Beak Cafe Revolutionaries, in conjunction with magical trade unions and the people with London
Cost: N/A
Where: Diagon Alley
Why: Workers of the world unite
When: May 1st, 1893
What: Hogwarts Study Week
Who: Hosted by the House Matrons in connection with the student book club, all students are invited to study for exams together in this annual end of term event.
Cost: N?A
Where: Spare Hogwarts classroom in the corridor leading to the library
Why: For students to study and to foster house relationships
When: May 14-18, 21-22
What: The Private Debut of the Meredeth Twins
Who: Hosted by Vernon & Charlotte Meredeth; Rashmika and Chandrima Meredeth are the guests of honor. All upper class of good standing invited.
Cost: N/A
Where: The Meredeth estate in Yorkshire — guests may apparate or floo into the foyer; if taking floo, there will be maids and valets on hand to deal with the soot.
Why: Veronon Meredeth has some respect for his first wife's native culture.
When: May 31