Japanese term
開場時刻,開演時刻
Non-PRO (1): humbird
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Proposed translations
United States
Fast, accurate, highest quality
Native in: English 
, Spanish
Works in: Japanese to English, English to Japanese, Japanese to Spanish, and 4 more.
Door opening time, Curtain opening (Performance start) time
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Note added at 22 mins (2008-06-02 13:16:07 GMT)
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I guess if you want it sound more natural, you could say: Doors open (at hh:mm), curtain opens/performance begins (at hh:mm).
Canada
Engineering translator
Native in: Japanese 
Works in: English to Japanese, Japanese to English
Doors open: Concert (?) starts:
Doors open at 7:30p.m.
Concert (or whatever event) starts at 8:00p.m.
開場時刻 is when audience can start coming into the theater. 開演時刻 is when the actual performances begin.
China
Broad knowledge base
Native in: Chinese
Works in: English to Chinese, English to Japanese, Japanese to English, and 1 more.
start time
Opens at, Performance begins at
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