Yes, but there are two ways. Travel expenses to a staff party can fall under the targeted exemption (business travel expenses at €0.23/km), outside the WKR discretionary scope. Or they fall within the discretionary scope, together with the other event costs.
The smartest approach is to use the targeted exemption for travel expenses. That keeps the WKR discretionary scope available for the event costs themselves (venue, catering, entertainment).
Have your payroll department advise on this, especially with large groups.