Other issues would still get coverage, and it's not like you miss very much unless something new develops, and that's unlikely because I wouldn't be surprised if most of thee world leaders will also be watching the royal wedding. The royal wedding is still news, and even though it may seem less important to you, there are people who do think it's a big deal.
And you're 15, I doubt you normally watch the news anyways unless your parents have it on and you happen to be in the same room.