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@Ibnana, in Jelly, the "Rainbow Party" event is found in your "Events" tab. In my case it disappeared after the rewards were claimed, but a new event starts each week (check page 1 of this thread for details). This event is different from the event in Candy Crush Friends Saga, which is called "Rainbow Run." You can find more information about it in the Contest section of the CCFS forum. Both the Jelly and Friends events feature boards that resemble Pride flags.
@PummyRaj and @Ibnana, I am going to speculate here. After my team has collected 400 fish and I claim the rewards, the event disappears from my Events. I am wondering if it disappears for all of my teammates, too. If one of your teammates finished the event for the week, perhaps it is no longer available for anyone else on the team, unless they had collected some of the fish. Try logging in on the first day of the event next week (June 20) and see if you get the event before a teammate finishes it.