Rashi on Exodus
פתח אהל מועד BY THE ENTRANCE OF THE APPOINTED TENT — the whole court is thus named (cf. Rashi on Exodus 29:11).
Siftei Chakhamim
The entire courtyard is referred to in this way. [Rashi knows] it does not mean literally at the entrance of the Tent of Meeting because why should these offerings be different from all other korbonos that are Holy of Holies, which are eaten [anywhere] in the courtyard of the Tent of Meeting?