They are available to meet during all park hours, including EMH. FPs for them, however, are only available during normal park hours and notoriously difficult to get besides.
If you are looking to go a little later my understanding is during the fireworks they close the line so if you act quickly after the fireworks you can sneak right in.
Thanks for the info friends! We don't typically rush right in straight to one thing as soon as the gates open as we like to enjoy Main Street.....thus looking for other alternatives in the event i can't snag a fast pass.