I think I might have the most experience here with this specific situation, so I'm reserving this spot for when I'm done snorting these narcotics.
EDIT:
Ok, 2C-E in public or even crowed places is very very intense. The first time I dosed it, it was 10mg and while peaking with my friend, we went to eat at a rib restaurant with my parents and little brother XD. At that low dose, I managed to keep my cool. Although I was convinced that several patrons of the restaurant were intentionally acting foolish to flush me out or something ehehe. Paranoid without the anxiety, it was almost "fun" feeling. Eating meaty ribs though, not fun on 2C-E
Me and that same friend also dosed 15mg and just walked around my suburban city, the business area. We sat in the deli area of a grocery store "people watching". It didn't go bad at all, and was very intense. The highly saturated colors were amazing from bright lights. We eventually got really self concsious about sitting in a grocery store deli for 3 hours without buying anything, and moved next door and ordered some friend chicken from this hood ass chicken and fish shop. Its run by an italian family and the dude looked like a straight mob boss haha. When they spoke to use they seemed to be speaking italian because I didn't understand it, but as they went on I realized I was tripping so hard their voices were scrambled. I somehow paid and left. XD
I would keep the group to like 3, 4 at the very most. Stay close etc. It's easy to get lost SOBER in a place like that. Your likely going to develope some type of mind trip about the crowd. At the grocery store I basically established that everyone inside but my friend and I, was severely retarded. The visuals made it look like it. And the way they just zombie shuffle around the store. Or you may end up thinking they're plotting against you, or that EVERYONE KNOWS IM TRIPPING. being around this many conscious humans stirs up the thoughts.
With something as analytical as 2C-E, public use is rather useful. Just watching the world unfold.