Here's the completed text with the correct Spanish forms filled in:
Un guateque campesino
Hoy yo voy (ir) a un guateque campesino. Es (ser) un evento (event) especial en Cuba. Hay mucha comida (food) y música (music). Yo estoy (estar) muy emocionado (excited). Para prepararme yo me ducho (ducharse), yo me visto (vestirse), y yo me arreglo (arreglarse) el pelo.
Durante la fiesta yo hablo (hablar) con mi (my) familia y mis (my) amigos. Ellos comen (comer) arroz y frijoles, pero el cerdo asado es su (their) favorito. Nosotros bailamos (bailar) mucho y nos cansamos (cansarse). La fiesta termina y yo vuelvo (volver) a casa. Yo me pongo (ponerse) los pijamas y yo me acuesto (acostarse).
Short Answers
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The verb ser is used in #2 because it describes the essential nature or identity of the event. In this case, the sentence states that "it is a special event," indicating what kind of event the guateque campesino is.
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The verb estar is used in #6 because it refers to a temporary state or condition. In this context, the speaker is expressing their current emotional state of being excited about attending the party, which is a feeling subject to change.