Thanks for posting your idea, Jonathan. You just never know how people will respond until they're faced with an event in the calendar that they can RSVP for.
I agree with Dwyane, in that for me it usually depends on what's involved in the meeting. I work from a home office and generally don't leave the house before 10am, as the first 3 hours of my morning is a great time for me to take care of business admin stuff and correspondence.
But if the event included a presentation, like Kim suggested, then I might be willing to reorganize my routine if the talk was compelling.
I say - try it! Put an event in the calendar and see what happens.
You're welcome to include a note in the description that says you require an X number of RSVPs within X number of days of the event or the event will be canceled.