"day of the summit" is a correct and usable phrase in written English.
You can use it to refer to the day when a particular summit or conference is taking place, or to refer to the day on which a summit or conference begins. For example, "Preparations are underway for the day of the summit, when leaders from around the world will come together to discuss important topics."
Hundreds of protesters have already gathered in the Czech capital and tens of thousands are expected to arrive within the next few days in the run up to the opening day of the summit on Tuesday.
This photograph was taken on the first day of the summit, at the shoe protest.
This article was amended on 15 December 2016 to correct the day of the summit.
The outcome is so uncertain that the two leaders have not scheduled a joint news conference for Monday, the last day of the summit meeting.
Cameron will attend the first day of the summit and is expected to explain Britain's position at a dinner on Tuesday evening.
Police in Manila confirmed they used water cannons against protesters in the Philippines capital on the final day of the summit, and suggested there would be prosecutions.
Standing in line next to me at Tru Value, the Saturday of the summit, a young man sports two-carat diamond studs in each ear, his shirt is airbrushed with an elaborate vine of "flowers" that resemble stacks of American dollars.
On day one of the summit, Uber Head of Aviation Eric Allison spoke about how certain skyports could handle hundreds or even thousands of landings per hour.
We're likely to hear a lot more about the chip tomorrow, on day two of the summit, so stay tuned.
And when North Korea launched a test missile just a day ahead of the summit, the U.S. said it had no further comment about the reclusive dictatorship.
Updated at 11.35am GMT 11.13am GMT EU summit resumes The clocks have struck noon in Brussels, which means the second day of the EU summit is officially under way.
