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When it has to do with an event, activity or a program, the appropriate preposition is "in". For instance, participants in a training workshop, seminar, football gala etc. When any other preposition is used, that other preposition might just be introducing an additional phrase ( or information) and in that case "in" is implied and thus taken for granted. Eg participants at level two hundred performed so well. In this sentence, at level two hundred is just additional information. The full sentence might have read participants in the competition (who are) at level two hundred performed so well.
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