ummm... duh?

"buy your tickets now, seating is limited!"

maybe it's just because i don't get out much, but i have yet to see any venue where seating is unlimited. you could argue in favor of "the universe," i suppose, although the event would have to be big enough for people in any area of the universe to see. if not, you're probably better off watching it on TV, in which case you really don't need to worry about seating.