Well looking at the maps this morning maps I think Saturday may actually be a good day for foliage in the NEK. Looks quite cloudy but other than a few sprinkles I think that the region gets Shadowed by the white mountains keeping the rain South and East of Conway NH Lincoln NH White River VT. Sunday on the other hand will be wet. The low pulls north and west through northern Maine into Quebec. This will cause Northerly flow, which is upslope in the NEK so look for clouds and periods of rain. Neither day looks great for fog as the best nights for fog are clear calm and cold nights but I do suspect it will be cool enough to have some patchy river fog. Temps both days will be cool.
Hope this helps
will keep you posted.