Yes, I have thrown events with a few champions and had them bring an executive. This has had about a 60% take rate (meaning 50% of the clients were able to get an exec to join. Now these are also events with more than one client. If you do this just with your champion, I'd suggest inviting another current client using the expansion product/feature/service to be able to speak to it. Perhaps their champion and executive as well.
And, I can say I have also had success with virtual events involving sake tasting with live oyster sshucking and whiskey tasting or cocktail making classes.