There are several tournaments to take a part of where you can chose to play in different categories and levels.
Here is a list of upcoming tournaments nearby:
Bygdø høsttreff 12-13.10, deadline 01.10
Frognerhøna 2-3.11, deadline 15.10
Racketspesialisten.no open (Vestre Aker) 9-10.11, deadline 22.10
Asker Open 16-17.11, deadline 29.10
Haugerud cup 7-8.12, deadline 19.11