Code Review Suggestions

[ColinM9991-zz]

Suggestion #1:
HttpClient is intended to be reused, instead of creating multiple instances for a request, you can use one HttpClient instance to handle multiple asynchronous requests
Line:

Looker/Looker/Looker/Program.cs

Line 29 in 4271012

HttpClient client = new HttpClient();

Suggestion #2:
The ToEvent method looks brittle, it uses long.Parse which will through various exceptions in certain cases, there are no sanity checks performed to see if the string is a correct Int64 and if it contains content. It may be good to use TryParse(string, out long);
Line:

Looker/Looker/Looker/Program.cs

Line 50 in 4271012

public static Event ToEvent(this RawEvent @event)

Suggestion #3:
Instead of concatenating the URL you could use a UriBuilder to do this for you, and pass a Uri object to your GetX methods. Using a Uri object will add an extra bit of sanity that says this is a correct URL before it gets as far as attempting to send a request.
Line:

Looker/Looker/Looker/Program.cs

Line 23 in 4271012

item.Venue = GetVenue(requests.VenueGetUrl + item.Venue + @"/?" + requests.AuthToken).Result;

Suggestion 4:
It isn't necessary to use an @ symbol when indexing your deserialized JObject

Suggestion 5:
It is safer to deserialize to a strong object instead of indexing on key names, spelling mistakes could happen.