River Thames the stretch of river from Chiswick to Putney. Two rowing events on the River Thames are traditionally part of the wider English sporting calendar: The University Boat Race (between Oxford and Cambridge) takes place in late March or early April, on the Championship Course from Putney to Mortlake in the west of London. Henley Royal Regatta takes place over five days at the start of July in the upstream town of Henley-on-Thames. Besides its sporting significance the regatta is an important date on the English social calendar alongside events like Royal Ascot and Wimbledon. Other significant or historic rowing events
Henley Royal Regatta crews race only once a day, each event has a limited number of places. Qualifying races are held on the Friday before the regatta. The regatta's Committee of Management decides at its absolute discretion which crews are obliged to qualify; the Committee will examine the form and calibre of the entrants and may choose to pre-qualify some of them. The qualifying races take the form of a timed processional race up the regatta course, with the fastest crews qualifying. Times are released for non-qualifying crews only. This does not stop an enthusiastic band of unofficial timers with synchronised watches working