all comers

Everyone who expresses an interest in being involved in or with something. Every club on campus has to accept all comers—no one is to be excluded. Medical school is not the sort of thing that accepts all comers—you have to have excellent grades and high test scores to get in. Well, I don't care what you pretentious jerks say—the art world should except all comers!

all comers

anyone who chooses to take part in an activity, typically a competition.

1992 Al Gore Earth in the Balance He has traveled to conferences and symposia in every part of the world, argued his case, and patiently taken on all comers.