From about 10am to 3 pm you should not have a problem. Listen to 750am or 98.5fm as you get close and if 75/85 is messed up downtown, then just take 285 around and avoid it. But you should be ok.

Exit 14 is GA20 in Cumming and Exit 13 is two miles south, GA141.

I believe we'll meet at Exit 14 since the lunch choices are better there. If you want to leave a day earlier, you can sleep in my spare room, I'm three miles east of Exit 14, just off GA20.