Asakusa is located in the heart of Tokyo, accessible from both Narita and Haneda, the two major airports in the area. It is a traditional town with full of historical sites and is now one of the most popular locations for travelers. 
To go from Narita Airport, take the KEISEI express line. 
From Haneda, take the KEIKYU line. 
Both would directly take you to Asakusa within an hour.

Narita Airport ~ Asakusa

Asakusa Gold Sounds (where the deathfest is at!)  is located within walking distance from Asakusa station, also a minute walk from the Subway Kuramae Station. Ask the station staff for direction if you need to, they’ll show you the way.