I've got last years book with me and the butterfly release is at East Future World on Friday, Saturday and Sunday at 11.00am.
The ladybug release is at the kids garden in Outpost World Showcase again on Friday, Saturday and Sunday at 12.30pm and 2.30pm.
I've not actually been to these demonstrations but they sound fun so perhaps I'll do them this year as we too are there during the festival. You should be able to get a booklet about the event on admission and it has a map showing you exactly where they are.