My question is whether there are events at the racetrack this January? I return to Mexico and I would like to visit Del Mar and see races

There are no live races in January - historically Del Mar races mid July - early September & November.

Hello, greetings from Argentina ? Is it like this every year? From July to November? I want to learn from there because it was an Argentine horse, Miriñaque, so would it run around Santa Anita, for example?

Events can be but horse racing cannot. Now they are in Santa Anita, in Los Angeles and they do not return until July.