Remove Upcoming Events/Past Events view in SingleEventsManyGroups configuration

[chrisreddington]

In the configuration of SingleEvents ManyGroups (e.g. A conference that has many groups), then the conferences pages still show the Upcoming Events and Past Events tab.

In the ideal world, we could associate activities with those events instead, but need to determine how much work there'd be to make this work.

In theory, the rough pseudo code would look something like -

If isset group_configuration && isset event_configuration
if group_configuration == multi && event_configuration == single
query for pages where page_type is activity and groups property contains this group
iterate through those under a "Related Sessions" tab
// no need for any past events, as we're talking single event configuration
end