My friend visited Naran during Bakra Eid (first day). There was nobody there. He performed the Namaz and total there were around 25 persons in the Mosque. So for bakra eid people usually go back to their villages / cities from where they are so as to perform the sacrifice.
i think that it is the best time to visit the northern areas during this time period. Why? low rates of hotels and good service.
Can't speak about Skardu because i have never been there and do not have any program also in the future for visiting Skardu. However I have a program of visiting Hunza in August or september this year allah willing
In the future i may visit Skardu but only if I get the information that the road has been repaired and not otherwise