If you enjoy planning and preparing for elegant parties with elegant floral arrangements, gourmet food, elaborate dcor that makes your guests feel like they have just arrived at a five star hotel, you are a formal host. If you feel more comfortable preparing a barbeque feast for your guests comfortable sitting amongst your friends in your backyard, you are a casual host. If you are neither, you may be somewhere in between. If you feel comfortable either way, consider yourself lucky.
Regardless of what kind of event you are planning, make sure you know exactly how much time and effort you are willing to put into the process. What kind of party you throw has a lot to do with how much money you can afford to spend. As a rule of thumb, casual affairs usually cost significantly less than formal affairs.
A good example of a formal party is a wedding. If you feel comfortable organizing such an event, so be it. If you felt uncomfortable by the constraints of such a formal event, you probably want to stick with the more casual route.
If you felt more comfortable at a casual party, try to remember why? What were the things that made you feel good at the party? Was it...