This is the 1782nd most frequent Japanese word.
入場
Entrance; admission.
Here, '入場' is used as part of '入場券' (admission ticket), referring to permission to enter a venue.
入場券をお持ちですか?
Do you have an admission ticket?
In this sentence, '入場' indicates the act or time of entering.
コンサートの入場は午後6時からです。
Admission to the concert begins at 6 PM.
Here, '入場' is part of '入場者' (visitors or entrants), referring to people who enter a place.