If this is truly a fundraising event, then everything in the event plan will be geared to raising this specific amount of money. The amount you choose should be what you hope to net, that is, the amount you plan to raise after expenses are deducted. You should develop a goal based on the team members and tools available to you. Start with a humble goal and an aggressive plan. It is always better to adjust the goal higher than it is to lower it as the event moves closer.