Originally Posted by
disneydame2004
Patience, young one!
Welcome to the real world, where you discover there are all these things call 'commitments' that keep you from being able to do whatever you want whenever you want to.
It sounds like you and your family need to make some choices. You will either have to miss a few days of practice or school, or go in July when it is hot and more crowded. Given the choice, of course everyone would rather go when the parks are empty and the weather is nice. But that's not always possible.
Going during a busy time of year just means you'd have to be more selective and plan better. Stay on property to be able to take advantage of Extra Magic Hours. Learn about and use FastPass to minimize your time waiting in lines. Pick your "must do" attractions before heading to the parks. There are a lot of tips out there on how to deal with the crowds.
As for persuading your parents, do your homework. In this case, research your vacation. Find out about any discounts or special offers, any special events going on during the time you want to go. Figure out how much it would cost. Decide what you are willing to do to make it happen - what practices can you miss, or how can you minimize the effect of missing some school days? Then pick a time when they are in a good mood, and ask if you can discuss it. Present your findings just like you would a report at school, so they see you've put some thought into it. Then let them have time to think it over.
Good luck.