@Goodevans,
Your sentence is actually correct as it is. In narrative writing, especially in past tense, it is common to use the past tense form ("made") to describe events that are perceived from the perspective of a future moment in the story's timeline.
Let's break down why "made" is appropriate here:
1. Narrative Perspective: The sentence is describing the bride's thoughts about a future event from the perspective of the present or past moment in the story. In this context, "tomorrow" is referred to as a future point relative to the current narrative moment.
2. Past Tense Convention: When writing in the past tense, events that are in the future relative to the narrative present are often described using the past tense. This helps maintain consistency and clarity in the narrative timeline.
3. Grammatical Correctness: Using "made" here indicates that the act of making their marriage vows will occur in the future, from the perspective of the bride reflecting on it now. "Make" would imply present tense, which would not fit with the overall past tense narration of your novel.
Therefore, your sentence:
"She now knew that tomorrow, when they made their marriage vows in front of family and friends, it would all be part of an ultimate grand design."
is grammatically correct and appropriate for your narrative style (past tense, 3rd person POV). It effectively conveys the bride's contemplation of an upcoming event from a past or present narrative standpoint.