Prompt for a crossover: Couple A accidentally makes travel arrangements to the wrong destination and intrudes on a special occasion for Couple B.
For example, what if Mehndi Hai Rachnewali's Raghav and Pallavi were supposed to go to the Padmavati temple in Tiruchanur, but they ended up at the Parshva Padmavati temple on the hill next to Makhamalabad village near Nashik by mistake, crossing over into Sundara Manamadhe Bharali and attending the wagon-pulling race in which Abhimanyu is competing against Daulat, followed by the mahāpūjā for which Latika has to serve food to the whole village?
Raghav could choose sides in the construction battle for the local mall project, and he would think of some sneaky stunts to make the race more exciting. Pallavi would be offended by beauty queen Kamini's remarks about old-fashioned sarees. Abhimanyu's dream of a sports academy would impress Raghav, but Abhimanyu would be outspoken about Raghav mixing exercise with alcohol. Latika would give Pallavi good advice about how not to lose money in business.
I am busy with a long story at present, so anyone else is welcome to take this prompt.
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