1character is a challenge where writers chose a character to write 50 sentences of fanfiction about based on different themes in a set

trickortreatex, a multifandom exchanged inspired by Halloween (though works don't need to contain Halloween themes/you don't have to celebrate), is still open for sign-ups until September 18th, 11:59PM UTC.

aspecex, an Asexuality and Aromanticism themed multifandom exchange, is open for sign-ups until September 20th, 10PM PST. Nominations are also still open until September 17th, 10PM PST.

10itemsorless, a fic/art exchange for for any ship with 10 works or less on ao3, is open for sign-ups until September 21st, 9AM Eastern. More info, including a link to the collection, can be found HERE.

swrarepairs, a Star Wars rare ship (less than 250 works that complete, in English, and over 1000 words) exchange, is accepting nominations until September 21st, 11:59PM Eastern.

fandommixtapeex, an 18+ multi-fandom exchange using songs as work prompts, is open for sign-ups until September 21st, 11:59PM Eastern. Rules/links/schedule is HERE.

eatdrinkmakemerry, a multifandom exchange celebrating food and drink, is accepting nominations until September 23rd.

yuletide_admin, an exchange for rare and obscure fandoms, has opened Yuletide nominations until September 26th, 9AM UTC.

ladiesbingo, a challenge for fanworks about relationships between women, is open for Round 13 sign-ups.