Where can i find when a store is going to have its next sale?

So i am going school clothes shopping in july and ive been going to the websites of stores we'll be going to looking for there next sale throughout the store.I couldnt find it anywhere.So is there anyway to find when a store is going to have there next sale?
These are some of the stores ill be going to....
jcpenny,journeykidz,sears,macys,justice,claires"(i think thats all)
These are some of the stores ill be going to....
jcpenny,journeykidz,sears,macys,justice,claires"(i think thats all)
claires

most stores have sales starting Friday ending sunday