What: DMLE Murder Mystery night
Who: Employees and plus 1's of DMLE employees
Cost: N/A
Where: A fancy Magical hotel in London
Why: Murdock feels bad about working his employees.
When: 5th October

What: Living & Dead Mixer
Who: Spirit Div hosting, invited are:

What: Devine Halloween Ball
Who: Ophelia hosting for UC society types.
Cost: N/A
Where: The Devine home in Wellingtonshire
Why: Halloween
When: 30 Oct 1891

What: Horticulturalists dinner party
Who: Benevolence Montague is hosting a dinner party for MC and UC types with an interest in horticulture, herbology and/or potioneering - planty people or patrons of planty people! If you are into plants and not antagonistic to Benevolence safe to assume you're invited.

Cost: N/A
Where: Benevolences Hogsmeade Home
Why: Benevolence needs an excuse to hostess an event
When: 23rd October

What: Funeral of Mrs. Cartwright
Who: Henrietta's oldest sister took the reigns on organizing it, as the Least Useless Cartwright. If you had a family connection to the Cartwrights or either of the two families Henri's sisters married into you're invited to the funeral, UC society types who aren't excessively purist (aka anyone who might have been on good terms with Mama) are invited to a reception at Hermione nee Cartwright's house to follow. It's not like we're taking invitations at the funeral though so if you happen to be wandering by and want to stop, go for it :P
Cost: No
Where: Asphodel Cemetery - funeral
A home in Wellingtonshire - reception
Why: Self explanatory.
When: 6 October 1891

What: The Debut of Miss Eudora King
Who: Miss Augusta King is pleased to welcome her great-niece, Eudora, into society. Invited are all members of the upper class with a good reputation.
Cost: —
Where: King Residence, Wellingtonshire, Hogsmeade
Why: Debuting?
When: October 31st

What: A capricious old bint, Mrs Grint, who doesn't like many people, has sent out a swath of letters to anyone she can think of - the letters, when opened by the addressee will make the person believe they are dead, complete with a cause of death.
Who: Anyone she can think of! She is MCHB - with pretentions of being a socialite but she isn't good at it, so any Upper or middle class society member, or anyone's name who may have appeared in the paper or WW for just about any reason, including WC staff who may have been interviewed/given statements etc
Cost: N/A
Where: Where ever you open the letter
Why: She held a party, and no one came and she is MAD AF.
When: Letters arrive 20th of October

What: Literal Ghost Stories
Who: Hosted by the History Club for any Hogwarts student who wishes to attend. British Ghosts have also been invited.
Cost: —
Where: Hamish's Classroom, Hogwarts
Why: It's...festive?
When: October 31st, Afternoon