"The wedding feast" refers to the wedding of Lecia's sister, Mona Cavendish, tomorrow, which is Tuesday. As for how the other party knew about this situation, Shard didn't even think about it, "Lake Goddess" knew that he wanted divinity, so naturally she would know of such trivial matters as a wedding.
At this time, the sunset had already dyed half the sky red, and the surface of Heart Lake Island Center Lake reflected the sunset, turning the small fish at the bottom of the lake red as well. The evening wind blew, causing ripples in the lake water, and amidst all this, Shard actually felt a sense of unexplained tranquility:
"Excuse me, do you know who I am?"
He actually asked this question right from the beginning, but in order to prevent the lake from disappearing after asking, he held back until now.
"No, I don't know who you are."
The White-robed Lady gently shook her head, her silver hair also turning red under the sunset: