In The Giver, what happens to the community after Rosemary's release?

When Rosemary was released, the memories that she had
received were returned to the community.  Chaos resulted.  The Giver was distraught and
in morning, so he was not able to guide and comfort the community members.  Although her
memories were mostly positive, the community was not used to having memories.  Those few
memories of pain had terrible consequences for the community members.  Although it is
not described in detail, remember that the community’s main purpose is to avoid any kind
of discomfort.

After Rosemary’s release, the community
waited a long time before choosing another Receiver.  They had to be careful to choose
someone who would be more reliable, and they had to wait for the community to recover. 
Jonas was watched very carefully for any signs of
faltering.

Another result of Rosemary’s release is a change
in the rules for the Receiver of Memory in training.  When Jonas receives his rules, one
of them says he cannot be released.  The Giver notes that this is a new rule.  The rule
is designed to prevent memories from being returned to the community
again.