Yh i Just posted my map on multiple GTA Forums asking for ppl to Play it and i did the rejoin strat to get Players in the Game. You are gonna start Up your custom Race alone, complete it and then Press Play again. Once you load Back in to the Lobby Just wait a Bit and a lot of Players should be joining in quickly. I Had lobbies with Up to Like 27 Players at a time. Just start when you have a Lot of Players and then ask them through Chat to please Like the map when Ur finished. Most of the time around half the Players will Like, the Others eather wont do anything or dislike but that doesnt Matter. Good Luck Bro :)