1st you have some very beautiful cels...I dont 
even collect gally but I wish I did now..

2nd you should never do anything that your not 
comfy with...especially with your obsession.
    bars and restaurants are very busy places 
and to be quite honest no one would be able to 
keep an eye on your "babies" for as long as you 
would find acceptable. (every second they are on 
the walls for example)
  Plus people do some very strange things to 
stuff in restaurants...like take about a billion 
little ketchup packets because they THOUGHT 
about getting frenchfries while they were 
looking at a menu..its crazy!
    Your friend would feel really bad if 
anything happened to your cels and you would 
feel worse...I say go with the paranoia and just 
explain the sitch..Im sure he'll understand.
     good luck with what you pick though..those 
cels are really lovely.