The phrase "are two occasions" is correct and usable in written English.
It can be used when referring to specific instances or events that occur at two different times.
Example: "There are two occasions when we will need to meet this month: the first is for the project kickoff, and the second is for the final review."
Alternatives: "there are two instances" or "there are two events".
Even though she may have given her individual thanks during the party, showers and weddings are two occasions when a written thank-you note is still a must.
Just before talking about the prairie, John Ames, the old pastor I quoted earlier, says this: There are two occasions when the sacred beauty of Creation becomes dazzlingly apparent, and they occur together.
"There are two occasions in one's life to celebrate: wedding and going home on vacations at the end of six months of training," said Mohammad Sardar, in his mid-20s, who was admitted to Lady Reading Hospital in Peshawar with a head injury.
The associated principal component time series shows that there are two occasions of significant reduction in the amplitude of the weekly activity in each year; these reductions are associated with two major holidays lunar New Year and Fall Festival (called Chuseok in Korea).
There are two occasions when he is interrogated by the authorities regarding taxes.
In SLY, it marked the start of a c. 12 kbp exact repeat, and there are two occasions where an ORF has been altered as a result of the intrusion of the 5′ UTR of an rpoD gene.
"There are three occasions where people speak to the media," Mr. Lankler said.
There were two occasions when I was made to do 'blow jobs' when I did not want to.
There have been two occasions in my life I have been motivated into the kitchen by literature.
I've got a tape of that". Before Sunday, there had been two occasions when the scoreline almost occurred.
"In the final third, there were two occasions where people have shot from unbelievable angles where there is someone to tap it in.
