If your child is grown up, then you don't need to make any hasty decision. Ask your child about the theme that you have selected.
However, don't force your choice on your kid. If your opinion hasn't been accepted the way you were expecting, you need to let it go. Make your child's opinion count more. You can handle your kid's birthday celebrations by yourself. However, northern Virginia and all other states have professionals that can elegantly handle all the matters of kids' birthday parties. Make sure to select those professionals which have earned a good repute in professional handling birthday parties in northern Virginia or the state where you live.
Invitations play an important role in birthdays. Always make sure to put up creative, aesthetically appealing, and theme matching invitations. Cards should not only look like your theme but the words should also match. For example, a hunk movie theme would obviously have more powerful words used in the invitations. Or if the birthday is of a girl, then a Barbie doll theme would have Barbie's typical words used with light girlish colors used on the invitation cards. Professionals planning kids' birthday parties in northern Virginia or any other place exactly know how to make invitation cards that match the theme. Northern Virginia, Washington DC, New York, and other states have numerous kids' birthday parties' planners. However, you need to find the one who can understand your specific requirements as well as budget constraints.
Decoration plays a critical part in any party. Birthday parties also need to be decorated in accordance with the theme selected. For example, if you choose to have a spider man theme, then your living room may have artificially created webs all over the place. It is important to plan a theme which can actually translate into decoration as well. If you select a very difficult theme then obviously you will need a lot more effort and budget to decorate for that particular theme.