Dear Steemies! I hope the following summarized list will help you a lot, especially if you don't know yet, what to post.
| Day | Challenge name | Initiated by |
|---|---|---|
| Monday | MonochromeMonday |  @old-guy-photos |
| Monday | FruitsAndVeggiesMonday |  @lenasveganliving |
| Monday | NeedleworkMonday |  @crosheille |
| Monday | foodphotography(DPC) |  @juliank |
| Monday | MondayRed (ColorChallenge) |  @kalemandra |
| Tuesday | TreeTuesday | @old-guy-photos |
| Tuesday | TrailTuesday |  @extremejogging |
| Tuesday | AbandonedTuesday | @kalemandra |
| Tuesday | landscapephotography(DPC) | @juliank |
| Tuesday | TuesdayOrange (ColorChallenge) | @kalemandra |
| Wednesday | BeachWednesday |  @lizanomadsoul |
| Wednesday | architecturalphotography(DPC) | @juliank |
| Wednesday | WednesdayYellow (ColorChallenge) | @kalemandra |
| Thursday | SunThursday | @lizanomadsoul |
| Thursday | BlueFlowersDay |  @aditzu |
| Thursday | TrippyThursday |  @blacklux |
| Thursday | MacroThursday |  @homeartpictures |
| Thursday | macrophotography(DPC) | @juliank |
| Thursday | ThursdayGreen (ColorChallenge) | @kalemandra |
| Friday | LoveFriday |  @liliana.duarte |
| Friday | MarketFriday |  @dswigle |
| Friday | FractalFriday |  @woodywood143 |
| Friday | streetphotography(DPC) | @juliank |
| Friday | FridaySkyBlue (ColorChallenge) | @kalemandra |
| Saturday | SaturdayView |  @luxurylifestyle |
| Saturday | BeerSaturday |  @detlev |
| Saturday | Caturday(only cats) | @dswigle |
| Saturday | sportsphotography(DPC) | @juliank |
| Saturday | SaturdayIndigo (ColorChallenge) | @kalemandra |
| Sunday | BeautifulSunday |  @ace108 |
| Sunday | SundayScentExperience |  @dutchess |
| Sunday | AnimalSunday | @homeartpictures |
| Sunday | goldenhourphotography | |
| Sunday | SundayPurple (ColorChallenge) | @kalemandra |
| Weekend(Saturday and Sunday) | RosesOpenWeekend |  @rosesopenweekend |
| Weekdays | MonoMad(themes changing weekly) |  @brumest |
| Every day | mydailypost |  @sol25 |
| Any day | bwphotocontest-themes are changing weekly |  @daveks |
Other: WhiteisWhite (https://steemit.com/photography/@dmcamera/white-is-white-challenge-explanation-and-rules-page)
(I refresh it permanently)