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Subbotnik and voskresnik (from Russian: суббо́та, IPA: [sʊˈbotə] for "Saturday" and воскресе́нье, IPA: [vəskrʲɪˈsʲenʲjɪ] for "Sunday") were days of volunteer unpaid work on weekends after the October Revolution, though the word itself is derived from суббо́та (subbota for Saturday) and the common Russian suffix -ник (-nik).
The tradition is continued in modern Russia and some other former Soviet Republics. Subbotniks are mostly organized for cleaning the streets of garbage, fixing public amenities, collecting recyclable material, and other community services.
The first mass subbotnik was held on...