The event has very specific wording

RULES

1. Use Orbs of Vitality to contribute to either the Namikaze Side or the Uchiha Side;

2. When the event ends, players who have more than 750 Contributions will obtain Advanced Refine Rune*10;

3. In the last day of the event, players can only claim rewards, and are unable to further participate in the event! Don't miss out!

Note the bolded section.