Incentives for Executives in Customer Reference Program

Hey all! Starting to kick the tires on how we'll reward/incentivize the advocates who participate in our customer reference program, which we'll be rolling early next year (I'm onboarding Champion as the SaaS solution). Most of the customers in the program will be execs (director+), so I'm thinking for that audience (e.g. exclusive opportunities to network, cool experiences, etc, not swag or anything commoditized). What have you guys seen/done?