This is primarily a public relations strategy to dominate the year-round sporting calendar.

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Some wonder whether the industry's calendar of seasonal shows in several different cities round the world may itself go out of fashion.

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In Chicago, more than a third of the district's 675 schools opened Aug. 13, part of a year-round schooling effort that spreads out the school calendar with shorter summer and winter breaks.

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The tennis season practically spans the entire calendar as well, keeping the top pros in the limelight year-round.

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Underneath the calendar that lists other available travel dates, there is range that shows what the round-trip total would be with taxes and fees included.

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Formula One has only once before had a 19-round championship, in 2005, but earlier this year, team bosses backed plans to expand the calendar to 20 races a year.

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