וְאֵ֥ת כָּל־הָעֵדָ֖ה הַקְהֵ֑ל אֶל־פֶּ֖תַח אֹ֥הֶל מוֹעֵֽד׃
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Rashi
הקהל אל פתח אהל מועד AND ASSEMBLE THOU [THE WHOLE CONGREGATION), UNTO THE ENTRANCE OF THE TENT OF MEETING — This is one of the instances where the lesser comprised the greater (the small area accommodated the whole congregation) (Leviticus Rabbah 10 9).
Chizkuni
ואת כל העדה הקהל “and assemble the whole congregation!” They were all to treat the priests as holy. (Sifra).
Ibn Ezra
all of the community denotes the heads of the tribes and the elders.