Looks like if you're going to an event, the 250 mile trip limit doesn't apply. As I read it, the 250 miles is for "testing operation" and "occasional pleasure driving". From the DMV website:
Registering your vehicle either of these ways limits your use of the vehicle to:
- Participation in antique car club activities, exhibits, tours, parades, and similar events.
- Testing its operation, obtaining repairs or maintenance, selling the vehicle or trailer, transportation to and from events as described in number 1 above and for the occasional pleasure driving not to exceed 250 miles from your residence.
- Carrying or transporting passengers, personal effects or other antique motor vehicles being transported for show purposes.