Some large chunks of empty seats even at United States v France at the Basketball Arena, one of the top draws. Organisers reacted by using one block as a press box overspill, while some troops were invited in to take up more empty seats.
Very few empty seats for the morning and afternoon sessions at the Water Polo Arena, but the section for the Olympic Family was half-empty for the morning sessions.
The boxing venue at ExCel, in terms of buyable tickets, was almost completely full.
The blocks of seats at Wimbledon reserved for those with accreditation showed the biggest gaps. The majority of the other seats were full, particularly the cheaper ones towards the back of the stands.
Great Britain's men started in front of a largely full house at Earls Court, although pockets of seats were left vacant. There were also unused seats in the delegation and media areas.
Wembley Arena, which has a capacity of 4,800 for the Games, has been officially sold out for the badminton. The hall has been close to full for the sessions held so far, with three rows unoccupied due to restricted view.
More than 65,000 were expected for the men's football at Old Trafford although many did not turn up for the first match (New Zealand v Egypt), but it filled up for Brazil v Belarus.
Decent attendances over the first two days of competition at ExCeL for a relatively low-demand event, with the arena approximately 80% full with Great British lifters still yet to compete.
Some empty seats in the arena at Greenwich Park but equestrian manager Tim Hadaway said that crowds often moved throughout the venue during the day, meaning some seats may be left empty at times - spectators can walk around the cross country course.
Almost packed at ExCeL today. On Saturday it started with quite a few empty seats, but filled up as the day went on.
The venue at Horse Guards Parade is averaging two-thirds full according to official attendances - the capacity is 15,000.
Close to capacity for today's morning matches at the Riverbank Arena.
There were only a handful of empty seats at the ExCeL.
The morning session at the handball was virtually full at the Copper Box.
Fewer empty seats today than yesterday - an estimated 1,000 were empty in the first session yesterday when the GB men were qualifying. Around 100 seats were given over to soldiers today at the North Greenwich Arena.
Packed out for all sessions at the Royal Artillery Barracks.
Reports of around 100 vacant seats in the two grandstands - which were sold out. The venue manager at Lord's said none of those were for sponsors or Olympic family as they are all housed in the pavilion.
The ExCeL Arena was around four-fifths full when the table tennis got under way at 9am and the rest of the seats filled up during the afternoon although it was never at capacity.