How to Say "booked up" in Spanish
The Spanish word for “booked up” is “completo” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
AdjectiveA2
schedule or reservation list

Examples
El hotel está completo hasta el próximo lunes.
The hotel is full until next Monday.
Llegamos tarde; la sala de conciertos ya estaba completa.
We arrived late; the concert hall was already full.
Capacity vs. Contents
Use 'completo' specifically when a space or event cannot hold any more people or spots. If you mean something is physically filled with stuff (like a stomach or a glass), use 'lleno'.
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