the opening of a 館 (kan) on a given day - library (図書館), museum (博物館), hall (会館), etc. / the first opening of such a facility

to open a 館 (kan) for the day - library (図書館), museum (博物館), hall (会館), etc. / to open such a facility for the first time

time / an event, case, occasion, moment; a specific period in time / a time of something / a season / a tense / (literary) the time during which a narrative takes place

library (building)

9/11 (September 11, 2001 attacks)

time of..., time for...

a female given name

hour, o’clock

at the time of...

time, moment / at that time, chance, occasion / hour, hourly