Definition of "jollification"

I shall go down with you on Wednesday in time for the jollification on Thursday. I always enjoy that day; they are such nice, friendly people, those good Hollingford ladies.

1864 August – 1866 January, [Elizabeth] Gaskell, “Drifting Into Danger”, in Wives and Daughters. An Every-day Story. […], volume I, London: Smith, Elder and Co., […], published 1866, page 92

[…] old Judge Harbottle had arranged one of his dubious jollifications, such as might well make the hair of godly men's heads stand upright for that night.

1872, Sheridan Le Fanu, “Mr. Justice Harbottle,” Chapter 2, in In a Glass Darkly

[…] the streams would run with wine instead of water and the whole forest would give itself up to jollification for weeks on end.

1950, C. S. Lewis, chapter 2, in The Lion, the Witch and the Wardrobe, Collins, published 1998