Akshat asked Niharika what she would be wearing for the following day's function / the next day's function.
In reported speech, the direct question "What will you be wearing for tomorrow's function?" changes as follows: (1) "will you be wearing" → "she would be wearing" (modal shifts); (2) "tomorrow" → "the following day/the next day" (time expression change); (3) question form → indirect question (no inversion). The reporting verb "asked" is used for questions. Examiners award the mark for correct tense shift and time adverb change.