Nick Broomfield is a documentary practitioner who operates heavily in the participatory mode. It could be argued that he over participates to the point that he breaks Ofcom rules. It could also be argued that the level of truth he unearths via the use of his high level of participation crosses over into the political reflexive mode of documentary. A specific example of when Broomfield does this is in Biggie and Tupac when he's talking to an old friend of Tupac and Biggie and the friend is claiming he has a tape of their un-released music and Broomfield is trying to manipulate this primary source into giving him the tape. 

Michael Moore is also heavily embeded into the Participatory mode of documentary. Moore engages with his primaries almost as much as Broomfield. Two significant examples of Moore's heavy interaction with his primary sources can be seen in Bowling for Columbine when he offers to go with two victims of gun crime to the main Kmart hub (which was the retailer where the bullets were purchased and that later injured them) to offer them back to them. Another example can be found in SiCKO where he again accompanies his primary sources (whose health had been affected by volunteering at the time of 9/11) to go to Guantanimo bay and then to cuba on a quest to find them affordable healthcare.

Morgan Spurlock is another documentarian who is firmly entrenched in the participatory mode, as can be seen in his feature length documentaries Supersize Me, Pom wonderful presents: the greatest movie ever sold, and his documentary series on More 4, 30 days. In all of these he subjects himself to a set challenge, in Supersize Me he spends 30 days living on nothing but Mcdonalds and in Pom Wonderful presents: the greatest movie ever sold, he goes on a journey which the documentary is about product placement and advertising, he is trying to fund it entirely via product placement and advertising.