It is basically Ishkar's engagement party/masquerade party..
RV will be making some announcement...he will be talking about his friend/clientale/business patner Shikhar...he will say that he would like to disclose secret about Shikhar...then he will say something(not audible)...i suppose probably introduce Ishaani and she will come...he will also say that how Shikhar initially didn't even knew the meaning of love but he helped him out and Shikhar fell in love with Ishaani...Ishaani is there listening...
That i suppose will be followed by RV dance with Ritika...Ishaani will be watching and will be awkard/teary eyed..
Then Shikhar's turn to make some announcement...he will say that saccha pyaar karne waley kabhi ghalat rastey par nahi hotey aur un ke raaste mil jaate hain..
he will also announce that they are having a masquerade party and masks will be handed to all the people present...if your pyaar is saccha...you will end up with your true love..
Then Radz IV:
They ask that Ishaani doesn't seems to be happy...she says yah bcz her engagement is with Shikhar(whom she doesn't loves) and she is trying to put up fake smile..
On another question she further adds that in the party there are alot things that are going to happen which will sort of shake both Ishaani and Ranveer and they will be in party but at the same time also lost somewhere..
Then the rules of masquerade paty that every 30 seconds the partners will change and in the end the one you will end up with is your true love...
They ask who is it going to be(Ranveer or Shikhar) ..she replies you will need to watch for that...same with the case of marriage question..she says that you will need to see that wedding hoti bhi hai yaa nahi..
I guess it is clear that Ranveer and Ishaani will end up dancing with each other at the party..
As for the marriages taking place...we know from spoilers that both are going to stop and not take place..