Potterfests

Fest Name: HP Halloween 2025 Mini Challenge
Origin: Hosted by hp_halloween
Links: Announcement & Prompts
Type of Challenge: Prompt challenge
Description: Write a double drabble (200 words) inspired by one of the Halloween prompts provided. Post your double drabble as a comment in this post.
Ratings Restrictions: All ratings allowed
Length Restrictions: 200 words

Fest Name: HP Spooky Saffics 2025
Links: Tumblr | Discord | AO3 & Rules | Overview
Type of Challenge: Prompt challenge
Description: A Hallowe'en HP femslash prompt challenge hosted by HP Saffics. You don't need to be a member of the HP Saffics Discord server to participate. Any medium is welcome. Generative AI is not allowed. AO3 collection will stay open from October 1 to November 5.
Ratings Restrictions: All ratings allowed
Length Restrictions: None
Timeline: October 1 - November 5

Fest Name: HP Halloween Fest
Links: Bluesky | Instagram | AO3 & Rules | Prompting
Type of Challenge: Anonymous prompt fest
Description: A HP fic and art fest featuring Halloween. Prompting is open till July 31.
Ratings Restrictions: All ratings allowed
Length Restrictions:
Fic: Minimum 500 words; no maximum
Art: None
Timeline:
Prompting: July 20 - July 31
Claiming: August 1 - October 12
Works Due: October 15
Reveals Begin: October 20

Fest Name: HP Halloween 2024
Links: Dreamwidth | Livejournal | AO3 | Rules | Requests | Sign-up on AO3
Type of Challenge: Anonymous gift exchange
Description: A HP Halloween double-drabble exchange running on AO3. Each gift must be 200 words exactly in length. The drabbles should revolve around Halloween, autumn and/or spooky scenarios. You can also write for prompts/people you weren't assigned. Even if you didn't sign up, you can still post treats for prompts/people you want to write for. Sign-up is open till October 17.
Ratings Restrictions: All ratings allowed
Length Restrictions: 200 words exactly according to AO3 word count
Timeline:
Sign-up on AO3: October 13 - October 17
Assignments due: October 25
Asking for pinch-hitter: October 27
Pinch-hitter assignments due: October 30
Works Revealed: October 31
You can repost your works elsewhere after November 3.

Fest Name: Flourish & Blott's All Hallows' Eve Fest
Origin: Flourish & Blott's Discord (Tumblr | Discord) | HP Fanfics Facebook | Harry Potter Fanfiction Subreddit
Links: Tumblr Annoucement | AO3 & Rules | List of Prompts | Prompt Form
Type of Challenge: Prompt fest
Description: A HP fest themed around Halloween or scary/spooky elements. Open to all HP characters and ships.
Ratings Restrictions: All ratings allowed
Length Restrictions: None. Minimum 2k if you want your work to be promoted.
Timeline: The fest is open all year. Promotion will only take place during September and October.

Fest Name: HP Halloween Fest 2024
Links: Twitter | AO3 & Rules | Prompting Form
Type of Challenge: Anonymous prompt fest
Description: A HP fic and art fest celebrating Halloween and all things spooky. Links to all the forms are available on their AO3 collection profile page. Prompting is open till July 31.
Ratings Restrictions: All ratings allowed
Length Restrictions:
Fic: Minimum 500 words; no maximum
Art: None
Timeline:
Prompting: July 20 - July 31
Claiming: August 1 - October 15
Works due: October 18
Reveals begin: October 20

Fest Name: HP Halloween 2023
Origin: hp_halloween | hp_halloween
Links: Rules | AO3 | AO3 Sign-up Form (require login) | Requests
Type of Challenge: Anonymous exchange
Description: A HP Halloween double drabble exchange (i.e., 200 words). Both sign-up and posting are done on AO3. You can post treats even if you haven't signed up for the exchange.
Ratings Restrictions: All ratings allowed
Length Restrictions: 200 words exactly
Timeline:
Sign-up opens: October 1
Sign-up closes: October 8 at 12AM UTC (or Oct 7 at 8PM EDT)
Assignments Due: October 25 at 12AM UTC (or Oct 7 at 8PM EDT)
Works Revealed: October 31 at 12AM UTC

To sign up, log in to your AO3 account. Then go to the AO3 Collection Sign-up Form.

You can see everyone's requests here.

Fest Name: Shadows and Spells
Links: Twitter | AO3 | Rules | Prompts | Claiming Form
Type of Challenge: Anonymous prompt fest
Description: A Draco/Harry prompt fest focusing on horror, halloween and anything that isn't human. Claiming has reopened. For more information, see this post. If you claim now, you are still required to meet the word count requirement (i.e., 700 words) for the second check-in on September 24.
Ratings Restrictions: All ratings allowed
Length Restrictions:
Fic: Minimum 1,400 words
Art: None
Updated Timeline:
Prompting: August 18 - August 26
Claiming: August 27 - September 2
1st Check-in (300 words): September 10
Claiming reopen: September 10 - ? *NEW*
2nd Check-in (700 words): September 24
3rd Check-in (1,150 words): October 8
4th Check-in (1,400 words): October 22
Extension application open: October 22
Posting: October 29 - 31
Late entries posting: November 15 - 17

Fest Name: Shadows and Spells
Links: Twitter | AO3 | Rules | Prompting Form
Type of Challenge: Anonymous prompt fest
Description: A Draco/Harry prompt fest hosted by drarryfest on Twitter. The themes of this fest are horror and Halloween. Prompting is open till September 2.
Ratings Restrictions: All ratings allowed
Length Restrictions:
Fic: Minimum 1,200 words
Art: None
Timeline:
Prompting: August 20 - September 2
Claiming: September 3 - 9
Posting: October 29 - 31
Late entries posting: November 13 - 17
Reveals: November 22

Fest Name: HP Halloween Fest
Links: Twitter | Timeline | AO3 & Rules | Prompting
Type of Challenge: Prompt fest
Description: A Halloween themed HP fest. Prompting is open till June 30.
Ratings Restrictions: All ratings allowed
Length Restrictions:
Fic: Minimum 500 words. No maximum
Art: None
Timeline:
Prompting: June 17 - June 30
Claiming: July 1 - September 28
Submissions due: September 30
Reveals begin: October 1