TIS, late entrants are possible. However, each state has a procedure with dealines to have one's name placed on a primary ballot. So, for all practical purposes those deadlines have passed or will pass shortly. Still, there are many unpledged delegates who could rally around a candidate during the convention.
Rally around a totally NEW candidate?
TIS
"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK
