The scenario that would likely be considered an exception to the right to peacefully assemble is:
A group of people protesting increased fees block the entrance to a bank.
Blocking access to a building, especially in a manner that interferes with business operations or public access, can cross the line from peaceful assembly to unlawful activity, such as obstruction. While peaceful assembly is a protected right, it does not include the right to impede others' access or violate laws regarding public order.