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Lawson-eve

Lawson-eve, -even
  short for Low Sunday even = Saturday in Easter week.

1725 Hearne R. Brunne's Chron. (1810) 521/1 Saturday in Easter week, or as it is also called with us Lawson even. 1841 Hampson Med. ævi Kalend. II. 236 Lawson Even is, therefore, Low Sunday Eve.

Oxford English Dictionary

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