On what date was there a demonstration by Estonian youth ?
The most outstanding achievements in this field are the national epic Kalevipoeg ( Son of Kalev ) , written by Friedrich Reinhold Kreutzwald ( 1803–1882 ) ; Gustav Suits 's ballad " Lapse sünd " ( Birth of a Child ) ; Villem Grünthal - Ridala 's ( 1885–1942 ) poem " Toomas ja Mai " ( Toomas and Mai ) and three poems by August Annist ( 1899–1972 ) .