A third party fundraiser is a company, organization or individual that holds a promotion, event, or sale to benefit a nonprofit without the nonprofit's participation. Often, before an individual, company or organization may proceed with their event or promotion they must fill out an agreement provided by the nonprofit in order to have permission to use the nonprofit's name or logo in promoting the event.
You are not a third-party fundraiser if you are a board member, staff member, or registered volunteer of a nonprofit.
Common third-party fundraisers are registered participants of races or runs who fundraise independently with their own team's events to benefit an organization, but without that organization's staff being involved in the planning and execution. Companies who dedicate proceeds of their own annual event to a cause are usually also considered third-party fundraisers.