I didn't personally go to the mew event, My dad went for me, because i had an SAT perp class. He was there as soon as the event started. When i got there an hour after the line was closed, (4 pm) there were still ppl waiting in line OUTSIDE. I didn't get my mew until 5 or so. I would be there at least 30 min before it starts, but if you want to get it right away, be there 1 hour+ before the event starts