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The Bulls will tomorrow take on Alexandra for the first time this season and the team hopes to walk away victorious, locking the cup away for another year.
Spark said the team was "confident" going into the game, but support from the sideline would be critical.
"We need to get them behind us.
"It's a White Horse Cup defence and we need our supporters there."
Arrowtown is third, one point behind Upper Clutha.
If it wins tomorrow and claims the maximum five points, and Upper Clutha loses against Maniototo and fails to secure a point, Arrowtown will take over second place and secure a home semifinal.
While a home semifinal was desired, the immediate focus was to win the battle against Alexandra and give the home crowd something to cheer about and celebrate, Spark said.
"We haven't had much rugby at home in the last month, so it will be nice to get the [crowds] back out again."
• Arrowtown plays Alexandra at Jack Reid Park, Arrowtown, at 2.45pm.