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 2019-2020
Number of events		44
		all editors	new editors2	returning new editors3
event attendances	absolute numbers	805	287	204
	per event, on avg.	18.3	6.5	0.54
unique editors1	absolute numbers	619	277	10
	per event, on avg.5	n/a	6.3	0.23