1)	counting each editor only once, even if attending more than one event
2)	subset of all editors
3)	editors recruited within the report scope who attended more than one event; subset of new editors
4)	includes first attendances by new editors who would later go on to return to another event
5)	effectively the number of such editors recruited per event

Report scope (Dashboard campaign(s)):		Wikimedia NYC: Simple APG 2018 - 2019
Number of events		52
		all editors	new editors2	returning new editors3
event attendances	absolute numbers	2035	779	774
	per event, on avg.	39.1	15.0	1.54
unique editors1	absolute numbers	1421	734	32
	per event, on avg.5	n/a	14.1	0.62