If you intend to vote
Don't wait for election day. If you intend to vote check to see if your party affiliation has been changed, name misspelled or other info is wrong. It's coming to light that there is widespread manipulation and voter suppression going on. For instance, anecdotal evidence is showing many people suddenly having wrong party affiliation so they could not vote in the primaries. Anonymous checked one states voter database hackability and broke in in 3 minutes through a widely known exploit.