on the eve of vs in the eve of

Some examples from the web:

• Ot on the eve of promotion.
• We are... on the eve of something big.
• Really, Marshal, on the eve of the independence conference.
• Well, consider this a warning on the eve of war.
• I'm right here... on the eve of his wedding.
• Never play with fire, particularly on the eve of your wedding.
• Not on the eve of promotion.
• I betrayed my dearest friend Mina on the eve of her wedding.
• That's not a very comforting thought on the eve of battle.
• It came so strong on the eve of the earthquake.
• The Emissary looks for guidance on the eve of battle.
• We are on the eve of the Sanremo Rally 1986.
• Managed to finish it on the eve of totalitarian destruction getto-A in the fall of 1942.
• Arrested on the eve of 2 women and children are subjected to execution.
• They are on the eve of the Referendum in Italy.
• The celebration already on the eve of a holiday began consecration of water in church.
• OK, on the eve of marriage Mehmet is seized by soldiers.
• 4 Especially long prayers which are said on the eve of New year.
• High tension on the eve of the summit between Trump and Erdogan.
• As well as two spectacular surprises to be announced on the eve of the festival.

Some examples from the web:

• In The Eve of St. Agnes, Keats uses the metrical romance or narrative verse form cultivated extensively by medieval poets and revived by the romantic poets.
• The poem certainly feels more dynamic for these contrasts—as we've mentioned before, not a whole lot happens in "The Eve of St. Agnes"and it reads slowly ...
• In The Eve of St. Agnes Keats' thought is perceivable in his effort to find a way to focus on beauty, here it is the beauty of love 'the heart's affection' from ...
• What evidence have you found in the Eve of St Agnes of 'surprise' and 'fine excess'? The Eve of St Agnes opens with the cold- we are immediately plunged into ...