Super Tuesday will be on March 3, 2020. Alabama, Arkansas, California, Colorado, Democrats Abroad, Maine, Massachusetts, Minnesota, North Carolina, Oklahoma, Tennessee, Texas, Utah, Vermont, and Virginia will all hold their presidential primaries on that date. en.wikipedia.org
Only 14 states (and Democrats Abroad) participate in Super Tuesday. Why only these 14, and what about the other 36? Do they still participate in the primaries?