A workshop run by the Midas Charity Appeals Service will give charity fundraisers an insight into grant-making by trusts, including an instant reaction to appeals from trust administrators.
Funders involved at today's London event are the Association of Charitable Foundations, GUS, Impetus, Inman and World in Need.
Vivienne Parry, administrator of the GUS Charitable Trust, said: "It's an opportunity to give people an insight into how their approach to a charitable trust is seen."
Parry, a broadcaster and journalist, said charities applying to trusts should avoid writing applications to suit the funder. They should also think about collaborating with similar organisations.
"We see a dozen applications for one sector and are aware of areas where there could be collaboration but isn't. If you see two similar applications, there is a danger that you don't use either."
GUS Charitable Trust made grants totalling £800,000 last year. The business group, whose divisions include Argos, Homebase, Burberry and Experian granted a further £900,000.