This is what a typical race day looks like:
The racecourse normally opens 90 minutes before the start of the 1st race (you can find the exact opening times here).
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Approximately 20 minutes before each race, the horses enter the lead ring. The most promising candidates are presented to the audience.
At this time the jockeys also enter the lead ring and go to their team (owner and trainer), the trainer gives the jockey the order, an instruction on how the horse is to be ridden in the race.