What is the difference between motions voted on during the conference and those that are voted on for members at large?

What is the difference between motions voted on during the conference and those that are voted on for members at large?

Basically, if any changes or amendments are made to the USMSA Constitution & By-laws it requires a full membership vote by written ballot. Motions that are voted on at the conference do not require any amendments or changes to the USMSA Constitution & By-laws.