I'm in. Tell me who I need to bribe to get this and I'll show up whenever and wherever I'm asked.
Now that would get some press! Say in June, random people who reserved in person before the reveal would get picked to drive beta cars for a week. Unless the beta cars end out having problems that would be embarrassing, this would be both a great perk and a huge publicity stunt. Another good use for beta cars would be the showrooms, provided they are close enough to the production cars.
Of course, since they have probably between 500,000 and 600,000 reservations, Tesla isn't in the business of increasing Model 3 excitement right now.
Anything to increase your chance of getting the car should be good I guess. ;)