She attended the fund-raiser 'at the invitation of' the committee chairperson. [=she attended because she was invited by the committee chairperson]
You have a 'standing/open invitation' [=you are always welcome; you are always invited] to visit us any time.
The event is 'by invitation only'. [=only people who have been invited to the event can attend it]
(..) I'm glad you can not sleep. And even Yeah you were, would to wake up. From within you." Send message. "Sexy Kitten" has accepted the invitation of "ChicoGrandex". The talk starts now. - Chicogrande? - Hello. - Really? (..)2013 Her