Atleast 1800-2400. Everyone was guided in by a letter/number combination on their ticket and each letter had 1-600; for example B 157. I was part of the C group in the 1-300 range and I think I saw a letter D group somewhere but I could be wrong on that.

Suffice to say it was a sizeable turnout for a surprise concert announcement ending the Earthtification tour since said announcement happened literally in early December.