The exhibition held twice every year.这句话对吗

The exhibition held twice every year.这句话对吗
The exhibition held twice every year.这句话对吗

The exhibition held twice every year.这句话对吗
The exhibition is held twice every year.

不对
was held

The exhibition was held twice every year.

不对...
表演是物...
不能自己就举行了```

The exhibition was held twice a year.