It is "a historic event"
It has always been my my understanding that "an" should precede "historical" and "a" before "historic".
Australia
For Howrse: Australia
The team from Australia.
It is a historic event - good or bad, it happened and is now part of history.
Australia
It was the most historic and wonderful event of that day, the sky is clear and every people waving goodbyes to their loved ones.
The settled people in Australia have the closest historic relationship to Britain. The indigenous population, New Zealand.
i was raised by wolves
u were born
who was in that event