I also have Sensory Processing Disorder.
All my friends know (both at home and uni) and my boyfriend is amazing- knows not to give me light touch on certain places, knows I need deep pressure, and isn't offended if I have to sleep in another room because of my hearing!
My uni mates are extremely understanding, and I now feel confident enough to go with the group I am closest too to the Uni SU, but they know if it gets too crowded or the strobe lights get too much I get disorientated. We take regular breaks outside and they check I am ok (they are lovely) but I feel comfortable in the uni SU as I know and feel very comfortable around most of the people there. If I had to go somewhere with people who I didn't know or trust, that would be very different.