The London 2012 Paralympics is set to be a sell-out but people should still expect to see some gaps in seating, chief executive Paul Deighton said on Friday.
"We have now sold about 2.3 million tickets. Our target was always to get to 2.5 million and we will," he said.
"My guess is that we will have another 200,000 or so tickets to sell, about half of those will be on sale before Games-time."
The organisers are "delighted" with the interest in the Paralympics.
London 2012 chairman Sebastian Coe predicted that many people watching these events for the first-time will be "blown away".
Many of the day pass tickets have been created to allow people to take in different sports as many of them will be new spectators of Paralympic events.
Deighton said: "If you take the venues like Goalball where effectively you have got a mixture of people in that venue and about a quarter of seats will be general admission for people who want to watch that sport - then there will be about three-quarter of the seats that will be for people who are rotating through on a day pass.
"The whole point is to give people a chance to sample different sports so you will see a churn through the biggest chunk of most of those venues.
"You will see some empty seats there as people move through them and try different sports.
"We really want to make sure that we only sell a ticket where a seat actually exists and you have a good view."
The take-up and resale of some tickets which go to the athletes' friends and families depends on who qualifies for the later rounds of the competitions.
Members of the public will see some empty accredited seats at the Paralympics, an issue that frustrated many spectators who could not get a ticket for the Olympics.
Deighton said: "There are fewer accredited seats at the Paralympic Games than there were for the Olympics but it is still the same situation where we set aside banks of seats for athletes to watch their fellow athletes, for broadcasters, written press, officials and representatives from the sports federations.
"Our understanding of where you have a restricted view or haven't and where you can move the barriers between accredited and non-accredited areas is very well refined now."
Up to 166 National Paralympic Committees will feature - the largest number ever to attend a Paralympic Games.