kinktober-2025 is an October prompt challenge, with three prompts for each day in October. The challenge to use one or more to create a work (or you can swap out for the alternatives).

whumptober is a month long prompt-based whump themed fanwork challenge set in October.

flufftober is a month long prompt based fluff themed fanwork challenge taking place in October

angstober is an angst themed month long prompt event in October

polyamships is running Polyartober, a daily art poly ship prompt challenge set in the month of October.

dreamwars is a Star Wars fandom chat community.

ships20in20 is an icon challenge community where once sign-ups open, you claim a ship and make twenty icons based off the ship and the provided themes.

thestoryinside, a comm where you sign up to and pick books for a partner's TBR list based off voted for themes and vice versa, is open for October sign-ups until September 30th.

festivids, a rare fandom fanvid exchange, is open for sign-ups until October 3rd, 11:59PM UTC (I know the page says Sept 30th but it has been extended)

amperslashexchange, a fic and art exchange for ambiguous relationships that are hard to definitively classify as either platonic (&) or romantic/sexual (/), is accepting nominations until October 4th, 11:59PM UTC.

swrarepairs, a Star Wars rare pair (fewer than 250 fics on AO3 that are completed, in English, and over one thousand words) fanwork exchange, has opened sign-ups until October 4th, 11:59PM Eastern.

eatdrinkmakemerry, a multifandom exchange celebrating food and drink, is open for sign-ups until October 5th, 8:59PM Pacific.