I agree, 8:00 am seems a bit early. It's brunch, right? Not breakfast. An 8:00 event requires most people to be up no later than 7:00am.
We had considered doing one at Crystal Palace when we first started planning. We nixed it becuase our wedding reception isn't ending until midnight. The idea of having to wake up to an alarm at all wasn't that appealing! Farewell for us is tough because for as many people as we have there, we have different vacation schedules as to their comings and goings.
I would send out an invitation to inform people. For us, we have sent out invitations to every event- the wedding, the rehearsal dinner, golf outing, etc. That way, they have the information in hand and available. If you're doing welcome baskets, you may want to include the informaiton there again.
We have also sent out newsletters to the guests. One soon after the Save-the-Dates but before the invitations; and now that we're a month out. We've also sent them out to the bridal party several times to keep everyone on top of the goings on and aware of their duties and timelines. You can send them out as an email attachment to the ones you have addresses for and regular snail mail for the ones you don't. If you want a cope of our first one, PM me with your email address and I will email it to you. The second one is still in editing!