can you please give me some advice?I really want to go to a pop concert next month with my friend.We have the tickets already and are looking forward to it.Unfortunately,it is on the same day as my grandparents';40th wedding anniversary.My parent want the whole family to go for an every meal together.They say I must sell my ticket and go to the meal instead.I think I should go to the concert because I planned that before they decided to arrange the meal.What do you think I should do?