Datasets - IF Formulas

[CD81]

Hi, i'm hoping to use an If statement in dataset formula field to identify when particular multi-select properties were chosen.

I'm getting a syntax error showing, referring me the support documentation, but i cant find any info relating to multi-select fields - my query is essentially If ([event] = BIOMUK 2022, 'true', 'false') In this case BIOMUK 2022 is a selectable option within the multi-select 'event' field. I've tried '=', is, LIKE and other operators but no luck. Am i missing something obvious/is there a way to phrase the formula that would work?