Donate This payment form can be used to simply donate to the event. Valley Center Western Days, Inc. is a 501(c)3 non-profit organization. As a donor/sponsor, you will be supporting the largest community annual event while promoting your business to the residents of Valley Center and Southern California. Sponsorships can be made by check, cash or credit card. Check donations can be mailed to: Valley Center Western Days PO BOX 1781 Valley Center, CA 92082 For Credit Cards, Please call us for card over the phone or visit 29115 Valley Center Road, Suite L.