Complete list of possible query input: "keyword", "keyword_set", "place",
"language", "organization", "image", "event", "search", "user".
With "..." the user can pass on additional parameters that depend on the
chosen query input. For example, when performing a search (query = "search"),
the search can be narrowed down with parameters such as:
q="konsertti" complete search, returns events that have the word "konsertti"
input="konse" partial search, returns events with words that contain "konse"
type="event" returns only "events"
start="2017-01-01" events starting on 2017-01-01 or after
end="2017-01-10" events ending on 2017-01-10 or before
For more detailed explanation, see http://api.hel.fi/linkedevents/v1/.