I need advice !

My loves b day is in April. We're forbidden to be together by my family so I won't be able to spend it with him. He looooves listening to fetty wap and the concert lands right in his b day and he really wants to go. But I won't be able to be there and it makes me feel so left out and hurt because of our forbidden situation and it's not like I can sneak out and go with him cuz I have school that day plus my family never lets me go out. So I don't know if it's morally ok if he goes with his two guy friends or if he holds off till a couple months when I get out of my family's house and we have the freedom to go together. I really want him to be happy and told him he should totally go. But inside I feel really sad and don't know what to do. 😔