Here's your text with the grammar corrected while keeping the wording, tone, and details essentially the same:

So my cousin studies at this university. There was an event on June 16th at Presidency University, Bangalore, where Kriti and Rashmika had gone for promotions. Shahid had not come. They were almost 2 hours late for the event, and meanwhile the students were shown the trailer and two songs on loop, which apparently killed the vibe and excitement of the crowd. People were asked to go to the auditorium in return for attendance, lmao. Later, the venue got filled after the actresses arrived.

Rashmika spoke less, mostly about her Bangalore connection, and spoke in Kannada for a while. When asked about Shahid, they joked that they had thrown him out on this girls' trip, not in a serious way, jokingly

Kriti made some threesome jokes, for which the crowd booed her. She also said something along the lines of girlfriends/boyfriends changing every 10 days to make the audience cheerful, I guess.

One funny thing my cousin told me was that the host asked people to raise their hands if they were Shahid's fans, and nobody raised their hands. 💀💀 Later, the volunteers had to make people raise their hands. Another funny thing my cousin told me was that people (organisers, the host, and volunteers) were not standing next to Kriti for long, and the reason was apparently because she's too tall and they seemed insecure.

Many people were screaming Vijay's name at Rashmika, and they played some games and danced while casually mentioning Shahid in between, that's all I know of 

Tea on Cocktail 2 promotions