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Consider these example sentences given by my grammar dictionary:
(1) 私はデパートへ贈り物を買いに行った。
(2) そこへ何をしに行くんですか。
Observation: The location is marked by へ instead of に.
Considering that a sentence such as デパートに行く is grammatical,
if the locations in (1) and (2) are marked by に, two にs would be present in the same sentence.
(Question): Can the location in (1) and (2) be marked by に? Would two にs cause the sentence to be ungrammatical?
Yes. They can. The two にs are different. The first is location, the other is purpose. The only restriction against using two particles in a single clause in Japanese is for を.
