Here's a great article by Rae Jacobson at the Child Mind Institute:
For many kids, summer vacation holds the promise of months of school-free fun. But for children with sensory processing issues, summer can be a challenging time.
From the sand on the beach to the fireworks on the Fourth of July, the season is full of exciting but potentially difficult experiences. An unfamiliar playground, a visit to an amusement park, a messy ice cream cone: all involve sensory surprises that can be overwhelming or upsetting if a child is unusually sensitive to light, noise, and tactile sensations. But with some preparation and planning parents can help kids with sensory issues get the most out of summertime.