June 8th is a Saturday right in the middle of the best overall walleye fishing for most people (warm, lots of fish, don't have to go far). I doubt any charter operation has a morning available, they will all be booked. You have two other issues. You're on South Bass, and you have more than 6 people, nearly double that. If you want everyone on the same boat, your options are few. Call the head boats in Port Clinton. They have smaller boats for parties just like yours you can charter just for your party. Drawbridge Marina, Fisherman's Wharf, Tibbels, etc. However, I'm not sure they will go to South Bass, and if they do, it's probably an additional charge (30-40 minutes just to get there). Or you can divide up into two groups, and take two boats (six people per boat). But you are back to the same issue - finding a charter that is available on that day, with two boats. Very unlikely. There is a charter that operates out of South Bass (Put-in-Bay). Same issue there. But call them to find out.

Your other option is an afternoon / evening charter. You are much more likley to find a boat. Inquire about that.

Other than a cancellation, it will be real hard to find a morning charter for a Weekend in June.

Also, there are probably a few web sites for charter booking that offer multiple operations. Look online for those, better chance of finding someone.

Good luck!