By now you should know the targeted size of your celebration and have the first draft of your budget complete. This is an important step, because without a budget to work towards it will be hard to communicate your needs to potential sponsors and secure financial or in-kind donations. Sponsors are more willing to give if they know exactly how their donation will help your celebration and what they can expect in return for their donation.
Asking for sponsorship will vary GREATLY in different countries. Please defer to your customs and business practices and share with us examples that work well in your location.
Meanwhile, your regional directors should also be helpful to help brainstorm possible sponsors and partners.