Monthly events are those events that will occur the next month. There´re actually two different events:
1- Foal to Adult: It´s when a foal becomes an adult. If you for example have a foal called "Echo" and it appears in the Monthy events section that it´s becoming an adult, you should start RP him/her as an adult.
2- Adult to Elder: It´s when an adult becomes an elder. (And it MUST die) If you for example have an adult called "Echo" and it appears in the Monthy events section that it´s becoming an elder, you should start RP him/her as an old horse and make it die soon.
Events are also didivided in three times of the month:
1- Early (month´s name): It means the event should happen between the day 1 and 15.
2- Mid (month´s name): It means the event should happen between the day 15 and 16.
3- Late (month´s name): It means the event should happen between the day 16 and the last day of the month.
B-Where are they announcend?
You can check them out every month in the News´ section that is in the left of all the pages.