It IS appropriate to use the passive voice in the sentence, The crowd was allowed into the bookstore starting at midnight for the release party.
Reason: It doesn't matter who "allowed".
However, if it mattered who allowed the crowd into the bookstore, it would need active voice. For example:
A salesclerk allowed the crowd into the bookstore starting at midnight for the release party. The next day, the manager fired the clerk because she had no authority to let the crowd in before the 1:00 a.m. release party.
OR another active:
The store owner allowed the crowd into the bookstore starting at midnight for the release party.
NOTE 1: The word "by" is often a clue to a passive sentence, along with helping verbs of the "be" variety (is, was, were, has, have, had, etc.).
NOTE 2: When you create active sentences, it makes sentences shorter--a good thing! So always try to put the actor FIRST, with an active verb.
Yes, it is appropriate to use the passive voice in this sentence. It emphasizes the action of allowing the crowd into the bookstore without specifying who allowed them in, shifting the focus onto the crowd's action of entering.
The crowd was let into the bookstore at midnight for the release party.
When making a title, starting a sentence, and doing commands
Proofread the presentation by reading the text backward, starting with the last sentence.
first edition
One might find a biography of Kurt Rambis from a local library, from a bookstore, or from a website. A good starting place would be to check a local bookstore.
Midnight, Midday, Midway and Midwinter.
It's not appropriate to start a sentence with "so". Starting the sentence with "This means" or "As a result" would structure the English better.
No, a comma is not needed after "yes" when starting a sentence.
Spain
starting a sentence with "at which time?
conditional sentence
It is a single day on a calendar with one date, starting from midnight to midnight. This would be different from things like a working day, which would not be 24 hours, or a 24 hour period starting on one day and finishing on the next day.