From the Boston.com "CelticsBlog":
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No suspensions for Celtics, Hawks
The Celtics will have no fines or suspensions stemming from a skirmish during Game 4 of their playoff series Monday night against the Hawks in Atlanta, according to an NBA official.
Celtics forward Kevin Garnett pushed referee Ed Rush off of him during the skirmish. Celtics center Kendrick Perkins and Atlanta forward Marvin Williams also stepped slightly on the playing floor from the bench.
Garnett said during today's practice he didn't think he should be suspended and Perkins expressed hope he wouldn't be. The end result is that both teams will have a full complement of players available for Game 5 in Boston Wednesday night.
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http://www.boston.com/sports/basketball/celtics/extras/celtics_blog/2008/04/no_suspensions.html