Autism Ontario has opened the applications for their summer respite funding. Generally each grant is a few hundred dollars and it can be applied to any program your child is enrolled in during the summer (even regular therapy or babysitting).
You have to submit proof of diagnosis with your first application, but after that, Autism Ontario will keep the diagnosis on file, which makes applying easier.
Once applications are closed, Autism Ontario sends out notices letting everyone know whether or not you've been approved. If you haven't been approved, it's still a good idea to keep your receipts from your program. I've had a number of years where I get a notice in September that extra funding has opened up and if I can submit a receipt within the next few weeks, I will get it reimbursed.