Because you give the time when it happened (last summer), use past simple. Easy as that.

DID Last summer = finished time frame, so you MUST use the past tense!

In general the past simple tense indicates an action that terminated in the past as here the action done last summer ended then. As for the perfect tense you would be using it to indicate that something rather happened in the near past and is extending to the present moment, which is not the case in your example.

thanks))

Probably best to use the simple past in this one. Implies that you know at least something someone did last summer.