Go to Multiplayer tab using
Session Name: By default the slot will list your gamer tag.
Game mode: Race
Player limit: 2
Password: Leave blank
to invite other player.
Once other player has accepted invite, ready up.
The game will soon start.
The race is a one lap long.
The other player can remain immobile. No fear of being booted for idling.
Once you've won the event, you need to back all the way out to the multiplayer screen.
This boots your partner out. (In my experience, if you don't back all the way out, the achievement does not pop.)
You invite him back into the game and run the second race, which you
I suggest that you win all three races
so you can get the International Driver achievement at the same time. (three online wins)
Once you've won the three races as host, have your partner set up the race so he too can get International Driver and Promoter.
DaDuellingDonuts writes: My recommendation is to do drag race, as you can do a single heat one, and finish in 20 seconds. Once it finishes, you can press x until the race starts again. I never backed out all the way until after finishing all three and preparing for a fourth.
Thanks for the tip DaDuellingDunuts