Added post-specific ID to article element
Created post ID variable
Used new post-ID variable in colloquia fetcher
Created filter to permit key LIKE value, not =

See example 5 here:
http://www.advancedcustomfields.com/resources/how-to/how-to-query-posts-
filtered-by-custom-field-values/
Changed get concerts for new query method
Enabled filters for get concerts function
Changed colloquium display function

* shows only next colloquium
* so h4 + p syntax
* added descriptive paragraph with time & location
Added concert display based on archive pattern