Dale Arnold did the Celtics???

[Kevin Vahey]

The WRKO website says the following

Dale Arnold (born March 27, 1956) is a sportscaster who is primarily
known as the co-host of the Dale & Holley Show on WEEI and the former
play-by-play announcer for the Boston Bruins. Dale is the only
sportscaster to do the play-by-pay for ALL FIVE major sports teams in
New England (Red Sox, Patriots, Celtics, Bruins and Revolution). Dale
will be calling the games with Joe when Dave is unavailable due to
other national play-by-play duties.

When did he do the Celtics?????

http://wrko.com/pages/1600475.php