What: Crime! At the Ball
Who:

What: Rally for Women's Suffrage
Who: Are you interested in women getting the vote? Are you interested in fighting against those who are interested in women getting the vote? This is for you!
Cost: —
Where: Ministry of Magic Atrium
Why: There's an election coming
When: August 1st at 3 o'clock

What: Honeyduke-Potts Wedding
Who: Laurel Potts on behalf of the happy couple
Where: Wildflowers rooftop, Diagon Alley
Why: wedded bliss y'all
When: August 20th, 1893

What: The Tale of the Three Brothers
Who: See Below
Cost: Ticket costs range from 2 knuts (very back) to 5 sickles (best seats).
Where: Hogsmeade Hall
Why: An activity for the children, Obvi!
When: August 18 & 19

What: Fairy Tale Masquerade
Who: Anyone who attended the puppet show.
Cost: Admission is included in your puppet show ticket!
Where: Hogsmeade Hall
Why: Traumatize the Children, Obvi
When: August 19 @ 7 o'clock

What: Garden of Mysteries Party
Who: Hosted by the Lestranges

Invited are mostly UCPB people with the exception:

• Notable upper class halfbloods.
  
• Notable middle class purebloods.
  

What: Academic Salon
Who: Hosted by Emilia Wright, invited at magical academic types. Mostly UC and MC, but 1-3 WC people who have made a name for themselves in these circles would get an invitation.
The way I see it, the invitations would be as follows:
If you're UC and upper middle class: because you'd run in the same circles as Emilia, if she merely knows you have ~academic interests, you'd be invited.
If you're lower MC and WC: because Emilia likely wouldn't personally know you, she'd only invite you if you are a known academic, have published papers, or a UC/upper MC person invited you as a +1.
Cost: Not really, but those in attendance can donate to a Hogwarts scholarship fund that Emilia is keeping.
Where: The Wright family estate, somewhere in England
Why: So the brightest minds can gather and talk science.
When: August 20th

What: Cecily Gallivan's 23rd birthday
Who: Hosted by the Gallivans. Invited are:

• Other Quidditch sponsors and their families.
  
• Everyone who plays for the Chuddley Cannons.
  
• Former Cannons players that are still friendly with the family.
  
• Prominent first string players from other teams.
  
• Misc. Quidditch related people that the Gallivans may know.
  
• Any friend of the Gallivans, whether they're Quidditch related or not.
  

What: A Charming Tea Party
Who: Hosted by Charlotte Quibbleberry & Emilia Wright

* Invited would be predominantly upper class people with reputations of 7 and above, but some prominent upper middle class people would be invited too.

Where: The Wrights' country home
Why: To have tea and show off your Charm skills
When: August 15th

What: Ministry Salon
Who: Oz is hosting and invited (some of) the department heads, assistant heads, and other leadership type people. Some areas are notably absent from the invite list and it's not clear if they were intentionally excluded or if Oz forgot those existed/did not consider them important. There is also one (1) woman on the invite list despite this gathering being hosted in a typically male space. Was she invited intentionally to be progressive? Did whoever was sending invitations just not realize she was a woman? Was she invited at all or did she just show up? No one knows and Oz is dodging questions on the subject.
Cost: No
Where: A parlor in London which is available to let for events, with the same general vibe as a gentleman's club — billiards, brandy, cigars, etc.
Why: Ostensibly a venue for Ministerial authorities to discuss their Most Pressing Issues and for Oz to nod sympathetically and promise to address them should he be elected. He is not entirely sure what is actually expected of him here, it just seemed like a Thing to Do when campaigning.
When: 12 August 1893 (afternoon, pre- any balls occurring)

What: Witches Hospital Charity Function
Who: A Typical Charity Function, hosted by Diana Abbott
Cost: A small, affordable fee plus donations by those who are able
Where: Hogsmeade Hall
Why: Absolutely No Reason at All...
When: 20 August 1893

What: Sweetie's Campaign Rally in Hogsmeade
Who: Sweetie is hosting with the aid of her mentor, Mrs. Patton. Open to the public. *Anyone of a rep lower than 6 will be politely asked to vacate the area
Cost: Free to come, donations to her campaign are politely encouraged.
Where: Padmore Park, Hogsmeade
Why: Sweetie is campaigning for your support for the role as Minister
When: August 24, 1893 starting at 11 o'clock

What: Sweetie's Campaign Rally in Irvingly
Who: Sweetie is hosting with the aid of her mentor, Mrs. Patton. Open to the public. *Anyone of a rep lower than 6 will be politely asked to vacate the area
Cost: Free to come, donations to her campaign are politely encouraged.
Where: Hawthorne Hollow, Irvingly
Why: Sweetie is campaigning for your support for the role as Minister
When: August 26, 1893 starting at 11 o'clock

What: Sweetie's Campaign Rally in London
Who: Sweetie is hosting with the aid of her mentor, Mrs. Patton. Open to the public. *Anyone of a rep lower than 6 will be politely asked to vacate the area
Cost: Free to come, donations to her campaign are politely encouraged.
Where: A Park in the Magical Area of London
Why: Sweetie is campaigning for your support for the role as Minister
When: August 28, 1893 starting at 11 o'clock

What: Miss Whitledge's Campaign Ball
Who: On behalf of Sweetie Whitledge, Mrs. Patton is hosting. Open to the upper circles to society, including any middle class that can spare a penny some nice clothing and the entry fee - Ministry officials may have this fee waived for themselves and a +1.
Cost: Four sickles per person.
Where: The Patton Estate
Why: For the schmoozing
When: August 25, 1893