Sridevi and Mithun Chakraborthy in garlands: Event for the film Guru

Sridevi and Mithun at an event circa 1987. Also in the audience, Sridevi's younger sister Srilatha. Anyone know what event / what occasion this was? 

Pls no one daft enough to say it was their wedding - cause it wasn't! 

It's either the mahurat/launch of Guru or audio launch or a party to celebrate the success of the film as the cast and crew of Guru are in the pics including Shakti Kapoor, 

Or was it something else?!! Date/location/place??