And many will also enjoy a beer or glass of wine in the sun because public parks and squares across the country have set up big screens.
Lawson Mountstevens, MD of the Star Pubs & Bars chain, said: “We predict it will be the busiest day of the year.”
The service is set to start at noon, but many boozers will choose to open at 7am thanks to special rules.
Millions will keep the party going well into the night with many pubs choosing to stay open later.
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Police think 100,000 will travel to Windsor, with pubs there hoping for a £1.5million windfall.
Overall, the economy could benefit by up to £100million.
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