Odessa event was to take place on Aug. 15
Warren Entsch defied party’s ban on voting for issue
LGBT advocates not invited to meeting with John Kerry
Ceremony took place in Vietnamese capital on Aug. 8
Prime minister on Tuesday blocked conscience vote
9-1 decision stems from case challenging Campeche law
Prime minister’s ruling coalition opposes gay nuptials
Advocate: Obama a ‘great supporter of equality’
Bill expected to be introduced in Parliament on Tuesday
Event took place a year after anti-gay law struck down
