My son has allergy to milk but it is not life-threatening. He can eat a cake made with a little milk but he can't eat the frosting. Last year I ordered a cake with fondant - and it was very pretty. We ate the cake, the fondant went to the trash (too artificial, no dairy though). I did a little research on the internet...
Chicago Diner, 3411 n. halsted, chicago 60657
###-###-#### meat free since 1983 (vegan bakery)
http://www.veggiediner.com/menus/dinnertext.html
This one claims they can work with you (and looks pretty good):
http://www.rosesbakery.com/
Rose's WheatFree Bakery Is Open!
Alergy-friendly, Roses’ Wheatfree Bakery delivers absolutely delicious 100% gluten and casein free baked goods. Enjoy our oven fresh breads, buns, pastries, cookies, pizza crust and cakes. Custom wedding and birthday cakes are our specialty!
Viisit our retail location and cafe at 2901 Central Street, Evanston, Illinois. You can always reach us at ###-###-####
If you have any luck, please let me know... I may use it for my son this year...