for what it helps, im in too!
ds now 9, was calmed last year by silly things, we were on the
DDp and believ it or not, when we had a sit down meal during the day he was better - dont know why, stability, normality, timings, not sure, but hey, thought the tip might help.
i have seen mentions of t shirts and thought i would share this, its from last year and shared back then, but as some of you are new, i ll share again if you permit-
DS is convinced stitch is autistic, due to his behaviour, an dtherefore we all love stitch, so the best friends bfast at the poly was an obvious choice for us.
i warned the handler as soon as we sat down that josh was excited, and although he would never hurt anyone, he would run over for a cuddle. both handler and "stitch" were amazing!
i share this because we printed the tshirts you were talking about, and everyday we had a different autism disign, 1 of us, dh or myself, and josh had his own special t shirts done (it also saved me a fortune buying official merchandise

.
thats the close up - ill try and find you a link if you r einterested to original dis ign, they are all done by the talented disigners on here. the "brother" one comes in "son" and "daughter" versions too!
the family one says "one in 150 families are affected by autism. please be patient"
we had loads of compliments on them, other autistic families asking where they could buy them - they really made our holiday easy as we were "transparent" didnt hide anything, and therefore didnt experience any bad looks or snide comments (well that i noticed anyway
hth
tracy