A lively and inspired talk at Stockholms Buddhistcenter in 2007, companion talk to The story of Hatthaka. (https://thebuddhistcentre.com/stockholm/story-hatthaka)
Ratnaprabha gives a good description of the 4 means of bringing together or gathering a sangha. One does this through generosity, loving (freeing, liberating) speech, beneficial activity and having or sharing the same goal.
A brilliantly told story from the Pali Canon, about Hatthaka, who used the 4 sangraha vastus, the four means of creating a sangha, to do exactly that. The four are: generosity, kindly speech, good works or action and exemplification.
Ratnaprabha explains these in the companion talk: The 4 Sangrahavastus. (https://thebuddhistcentre.com/stockholm/four-sangraha-vastus)
