The group has unveiled a heavyweight panel of speakers for the 21 March event, including Liberty director Shami Chakrabarti, and Independent Police Complaints Commission chair Nick Hardwick.
Workshops include talks on the benefits of joining coalitions such as the Make Poverty History campaign.
The conference's theme is ‘accountability in campaigning'. The NCVO wants to show voluntary sector PROs the ways in which they can demonstrate their campaigns' effectiveness.
It said it was important for PROs to make themselves accountable to supporters, funders, and the people on whose behalf they are campaigning.