1. The meeting takes place from two o �clock on Friday. This means the meeting starts at 2 o �clock on Friday.
2. This shop is open until nine o �clock on Friday evenings. This means that the shop closes at nine o �clock every Friday evening.
There is no problem with the sentence compositions. There are, however, several other ways to say the same things.
Regards, AB
edit: sorry, puddyd is correct... the first sentence shoulf be a little different:
The meeting of the History Museum staff/... takes place from... or
The meeting at the History Museum takes place from... or
The meeting for the History Museum staff/... takes place from ...
Good night!