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