This section is an optional section for the host to fill out. The purpose of the Goal Start Amount is to specify your proceeds raised before your silent auction or raffle started. To get there, you just need to go to Settings > General Settings.
For example, if your fundraiser is a month away, but you have already received $1,000 in donations prior to the event, you can set the Goal Start Amount to $1,000.
Any donations collected during your Accelevents fundraiser would then be added to the start amount of $1,000 so that you can have an accurate total of your funds raised.