coming in together; influx; entry of people
Noun referring to people coming into a place, often as a group or influx. It is especially natural in written or statistical phrases about visitors entering an area.
During the long weekend, many tourists came in.
unreserved seats for the public; general public seating
Older or specialized use for public, unreserved seating, especially in contexts such as theaters or public venues. Modern everyday Japanese more often says 自由席.
市は週末の入り込みを調査している。
The city is studying how many people come in on weekends.
In old playhouses, spectators sat packed together in the public unreserved seats.
The influx of tourists into Kyoto is increasing.
I got into the theater with unreserved seating.
Last year's number of visitor arrivals was higher than the year before.
自由席 is the modern, everyday term for unreserved seating, while 入り込み is an older or more specialized word for the same idea.
入場 is the standard, formal word for entering or being admitted to a venue, while 入り込み emphasizes people flowing in as a group or influx.
指定席 refers to reserved, assigned seating, the opposite of 入り込み's unreserved, first-come public seating.
Derived from the masu-stem/noun form of 入り込む, with 入り meaning entering and 込み conveying coming or being packed into a place. The exact historical development of the specialized seating sense is uncertain.