赏月 is a separable verb (离合词) meaning 'to admire the full moon' — a traditional Chinese activity especially associated with the Mid-Autumn Festival (中秋节). The verb 赏 and the noun 月 can be split by aspect markers, duration, or measure words: e.g., 赏了一个小时的月 ('admired the moon for an hour'). You don't put an object after 赏月 directly; the moon is already part of the compound.