Can any other entity, besides a competent Legislature or competent authority, make changes to these laws after the appointed day?
Yes, any other entity besides a competent Legislature or competent authority can make changes to these laws after the appointed day. This is because the context does not explicitly state that only a competent Legislature or competent authority can make changes to the laws. The phrase "until amended or repealed by a competent Legislature or other competent authority" suggests that these laws can be changed, but it does not specify who can change them after the appointed day.