I live in London. Very high rates of Covid and rising. It is DD’s best friend’s 21st birthday and she is having a party. We are not happy about her attending and have told her so but she is insisting on going. Her cousins were 18 and 21 this year and have managed without celebrating!! I am friends with her best friends Mum and have told her of my worries but she is all breezy about it saying they have a marquee so they can go in the garden (still not allowed). So WIBU to anonymously report the party even though it could get them all in trouble? Or should I just cross my fingers and hope for the best?