I see someone posted rules changes in November but now there is this addenda
Help me understand ? The rules being discussed here are for the following season? Or does little league usually announce rules changes right before meeting and debating more rule changes?
Consider me confused
Congress happens every four years. Typically the changes at Congress are larger than your normal rule change. (I say typically because, well... there have been exceptions.) The changes you saw earlier came from the Little League Board of Directors, which also sets the Congress agenda.
Congress is a "convention" format that includes this agenda. There are educational pieces and other forums, as well.
Some of these may get implemented immediately after Congress. (e.g. 15-run rule would probably become immediate.) Others may wait until 2019 for implementation if it would cause too much disruption. (e.g. Item 1)