So to specifically play board to board - players have to coordinate.
We have a list of ChessUp people who are open to adding friends on Chess.com:
Chess.com User Names - Share if you would like to play ChessUp vs ChessUp
The reason it is best to coordinate - is the player pool is small (vs Chess.com). So it takes coordination between the board players to set up a match.
We should maybe set up a slot each week for a club of sorts. I think now that we have board to board challenges, it is the right time to do that.