If they do it similarly to Star Wars weekend....in May we caught the earlier (there were two that night) showing of Fantasmic; had plenty of time to walk to the mainstage (where the Sorcerer's Hat used to be) and stake a place to watch the Star Wars fireworks (I should add, that Star Wars show/fireworks started almost 15 minutes later than published time, but we would have be on time anyway).
The Star Wars fireworks were amazing; can't wait to catch the Frozen fireworks (hope I can!).