- create Category:AttendeeList
- create Template:AttendeeList
check Help:Selecting_pages#Wildcards Wildcard behavior
{{#ask: [[Attendee events::~*2017*]]|format=count}}
53
{{#ask: [[Attendee events::~*Fall 2017*]]|format=count}}
175
{{#ask: [[Attendee events::~"Fall 2017"]]|format=count}}
52