The film centers around the intricate planning of an extravagant wedding within a contemporary Indian family. Lalit Verma, portrayed by Naseeruddin Shah, and his wife Pimmi, played by Lillete Dubey, are preparing for the marriage of their daughter Aditi to Hemant Rai, the son of a family friend residing in Texas. Although Aditi, who is played by Vasundhara Das, has only met Hemant a few times, the impending wedding brings the entire extended family together from various parts of the world, burdened by their emotional histories.
Supporting Lalit and Pimmi in this chaotic endeavor are Pimmi's sister Shashi and her husband C.L, who have traveled from Oman. Just days before the engagement, Lalit's affluent brother-in-law, Tej Puri, arrives from the U.S. Tej, who is married to Lalit's sister, has previously aided the Verma family in regaining their financial stability after the hardships they faced during the Partition of India. In a generous gesture, he offers to finance Aditi's cousin, Ria Verma, played by Shefali Shah, to attend university in the U.S. However, Ria, who lives with the Verma family after the death of her father, remains distant from Tej, feeling uneasy in his presence.
As the wedding plans unfold, Lalit struggles with the finances of the wedding, experiencing embarrassment as he borrows money from friends. Meanwhile, P.K. Dubey, the quirky wedding planner, finds himself enchanted by Alice, the family's maid. Complications arise for Ria when she becomes apprehensive about witnessing Tej's suspicious behavior towards her younger relative, ten-year-old Aliya. Aditi's younger brother, Varun, plans an elaborate dance for the pre-wedding festivities, creating tension for Lalit, who fears his son's growing effeminacy and contemplates sending him away to boarding school. In a twist of fate, Alice faces accusations of theft from the workers when they spot her trying on Aditi's wedding jewelry, causing her to withdraw and leaving Dubey heartbroken.
In an emotional turn, just days before the wedding, Aditi confesses to having slept with her old flame, her married boss, Vikram. Despite a moment of anger, Hemant appreciates her honesty and believes they can move forward in their relationship. The workers eventually apologize to Alice, leading to her reconciliation with Dubey. The night before the nuptials, Varun refuses to dance due to Lalit's comments, and Ayesha steps in to perform alongside Rahul, Pimmi's nephew. As Aditi and Hemant draw closer, they share intimate moments that strengthen their commitment.
However, the atmosphere shifts when Ria interrupts Tej's inappropriate behavior with Aliya, revealing that Tej molested her during her childhood. Although Lalit's sister dismisses Ria's allegations, attributing them to her character, Ria, feeling betrayed, opts to leave the gathering.
Lalit attempts to persuade Ria to stay, expressing his inability to disown Tej despite his sympathies towards her. Ultimately, Ria agrees to return for Aditi's sake, but as the wedding nears, Lalit courageously decides to expel Tej and his sister from the celebration.
As the Monsoon rains commence, Aditi and Hemant partake in their elaborate wedding ceremony, while Dubey and Alice have a modest wedding of their own, ultimately celebrating alongside the Vermas. Ria finds solace as she chart her path forward, finally able to immerse herself in the joy of the festivities.
