Here is a format that can be used to earn 100% grade on the new WPPR v5.0 used by IFPA

Double Elimination Tournament -- 10pt system
Minimum players 8

This format requires 4-player group games. Players are assigned to a foursome. If seeding is not provided by the event, the foursome will determine a ranking for picking games (dice roll, rock/paper/scissors, etc).

Game 1 -- Top Ranked Player gets choice of position or game. If position is chosen, the next player in line chooses game. Players will play a 4-player game. The winner of the game earns 5 points. 2nd place earns 3 points. 3rd place earns 1 point. 4th place earns zero points.

Game 2 -- 2nd Ranked Player gets choice of position or game. If position is chosen, the next player in line chooses game. Players will play a 4-player game. Points are assigned as they were in game one.

Compare scores of all players. If one player has 10+ points, the match is over. If nobody has 10+ points, move to next game.

Repeat the process every game until a player has accumulated 10 points or more. If two players have more than 10 points after a round, the player with the higher number is considered the winner.

It is possible for all players to have 9 points after 4 games. This will require a fifth game to determine a winner of this match. So based on this probability, this match is worth 5 significant games.

So if you have a double elimination scenario, where the top two players are considered winners and the bottom are considered losers, you can have 5 rounds of play to determine a winner.

Matches can last a minimum of two games or a maximum of five games.
I recommend having 1 machine available for every 4 players.

Example:

8 players
2 machines

Round 1 (+5 games: 5 total: 20% Grade)- Two 4-Player matches. Top two players of each group earns a win. Bottom two players of each group earns a loss.

Results: 4 winners advance to Round 3. 4 losers advance to Round 2.

Round 2 Loser Bracket (+5 games: 10 total: 40% Grade) -- One 4 Player match. Top two players earn a win. Bottom two players are eliminated.

Results: 2 winners advance to Round 4. 2 losers eliminated.

Round 3 Winner Bracket (+5 games: 15 total: 60% Grade) -- One 4 Player match. Top two players earn a win. Bottom two players earn a loss.

Results: 2 winners advance to Finals. 2 losers advance to Round 4.

Round 4 Losers Bracket (+5 games: 20 total: 80% Grade) -- One 4 Player match. Top two players earn a win. Bottom two players eliminated.

Results: 2 winners advance to Finals. 2 losers eliminated.

Round 5 Finals (+5 games: 25 total: 100% Grade) -- One 4 Player match. This match is for the event win. First player with 10+ points is the winner of the event. In the event of two players pass 10 points on the same game, the highest point total is the winner. Rank players 1-4 for final rank.