Not so simple these days as these boards are hidden behind help. The best way is to search by tag. I only know of monoMonday (currently hosted by JoanneInOz); and derelict Thursday; I'm sure there are challenges on other days too. You join by simply posting a photo and tagging it 'monoMonday' (next week will be 'mm56') or 'derelictThursday' . . . hope this helps.
How do I join the challenges?
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