i would say wait until u atleast know what colors ur gonna wear and then go for a makeup trial.. i highly recommend saleha, makeup by rabia, or anna shafei... all 3 have repeatedly done a fabulous job on the brides i have seen over the summer...
rami is a little more expensive but does an amazing job, other cheaper alternatives are 'sprinkles', 'son ray', and 'professional party planners'.. they do a fairly decent job for a much less cost!
all the clothes in devon are soo overpriced and ugly! i had a difficult time finding anything that looked pakistani... all the styles were with the short 'choli' and the 'lengha'...why dont u try contacting someone thru facebook (there are loads of designers on there!) and do some research and find someone u can send a pic to and they can copy it... obviously ur going to have to get lots of good referrals before u make this type of investment... i was actually doing this but then i squeezed in a trip to pakistan and got my own outfit... but again, devon is a bad idea!
the only mehndi lady i know of is parvin who i got my mehndi done from and my friend got hers done from her just a couple of months ago.. shes amazing but quite expensive... u should try contacting the girl from Bibya salon in devo, if u like that indian style "bhari hui" mehndi...
good luck! atleast im married but i have to go thru all of this for my brother's wedding in dec... and his fiance is not from chicago so i have to set everything up for her.. but im excited =)