- (void) calendarMonthView:(TKCalendarMonthView*)monthView didSelectDate:(NSDate*)date{
    // if your predefined date = passed date, show your popup (UIAlertView?)
}

-(void)calendarMonthView:(TKCalendarMonthView*)monthView didSelectDate:(NSDate*)date{

    if([[dataArray objectAtIndex:date.dateinformation.day - 1]boolValue])
        {
            //Pop view code
        }

 }