I don't know if there's alist but the challenges are
Mono Monday hosted in February by Mrs Linda
Tiny Tuesday hosted in February by Trisharoonie
AbstractThursday hosted by youoregon1
FlowerFriday hosted by Biker Bear
Filmstar Friday hosted by Beewriter and Green56
Derelict Sunday hosted by TMLHereandThere
For the whole month of February there is a Dickens Challenge for hosted by Hildasrose and Chantler63 and a Mono Month Challenge hosted by Skeena.
Sometimes it's easier to follow the hosts so you know what the themes and tags are.
Hope this helps.