So let me get this straight: They don't have time to call the police to report child molesters, but they have time to call you up about a private, family party, to try and berate and guilt you into - what, exactly?
Those Elders are petty douchebags who are trying to impose some sort of police state mentality among their subservient flock. Since when are THEY the "Masters of your faith"? Since never.
Their behaviour about a private family function, is quite frankly appalling. I'd point blank ask them who the hell they think they are calling you up about ANY of it? Freakin' asshats!