There are a couple of things that need to be stated in a question like this. The first is that the idea of "main events" will differ from person to person. Therefore, what I consider to be the 20 main events of a story might not be what another person considers to be "main events." It is important that this is kept in mind with a question like this. Another issue is that, unless there is specific directions to counter, really anything can count as a main idea. The internal revelations of characters, the discovery of their motivations, as well as implications of the plot development and thematic conctent connection can constitute as a "main event." It is important to keep this in mind.
Accordingly, coming up with 20 statements of Maleeka's experience is not that difficult. The setting can be one main event, the description of the main character can take up multiple main events, the interaction with her English teacher, Miss Saunders, can be another event, as well as Miss Saunders' description of her skin can represent another. Following this, 20 events is something that can happen with relative ease.