A blue moon occurs when two full moons happen in one month. Since one full moon occurs every 28 days, it doesn't happen very often, hence the phrase.
You could refer to it as a quarterly event.
Current events refer to the important occurrences and developments happening in the world at a specific point in time. These events are usually newsworthy and have a significant impact on society, politics, economics, or culture.
This question is incomplete. What event do you refer to?
the circumstances surrounding the event
Both refer to a length of time that begins with a change or event that affects many people.
Both refer to a length of time that begins with a change or event that affects many people.
To refer to actions that are happening now (at the present moment)
allusion
What event? Refer to this page: http://www.tektek.org/gaia/item_search.php?s=2008
The present tense allows you to refer to things that are currently happening.
Refer to make a timeline.
Refer to or make a timeline