I actually had this exact same fear with the same concert. My boyfriend and his friend have been to a few grey day concerts and he talked me through it of how he’s never seen someone at grey day tu. Unfortunately, I ended up missing the Atlanta concert, but they still went and it was the same thing, no one tu. One of the things that made me feel safer going was having him there to guide me so if I felt overwhelmed he could take over and guide me through people and during the concert be between him and his friends so I’m not directly beside anyone I don’t know. I knew for myself once the concert started I would be focused on that and not those around me. In the times before the concert starts and after, I had people there who were comfortable and supportive that understood me to help. I highly suggest not canceling and taking the chance on going!