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Unless there is someone with a better explanation for this, I think it's because a party is not a person, an object or an animal that can be moved from one place to another and still be what it originally was. It is rather an activity or a situation that mostly depends on the place where it can be held.
So you think in terms of the identity of the thing, which in this case is an activity, so we use the verb "ser".
- ¿Dónde es la reunión?
- La junta será en la oficina del jefe.
- El baile de graduación va a ser en el gimnasio de la escuela.
- El partido es en el Estadio Azteca.
- ¿Sabes dónde fue el último concierto de Madonna?
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