Looking at the Sonics home schedule, it seems unlikely that the PAC NW regional will happen at Key Arena without changing the Sonics schedule. Looking at the Sonics opponent for 3/15, it seems very unlikely that they will move the game because it may already be sold out.
P.J.
http://www.nba.com/sonics/schedule/i...eason=2001#Mar
p.s. - also note that the Sonics have at least 1 home game during each weekend of the regional season.