Weekend shows on a weekday? Aged events for young horses? The terminology cutters use can be pretty confusing for a newcomer. This page does a good job of explaining the difference.
Basically, there are two different types of competition: weekend events and limited-age events, aka “aged events.”
"Limited-Age Event (LAEs) Classes" are for horses of a specific age. In general,
futurities are for 3-year-olds, derbies are for 4-year-olds, and
classics or maturities are for 5 and 6-year-old horses. Aged events
often (but not always) have more added money, as well as higher
entry fees. Typically, contestants go through one or more
qualifying rounds before the finals.
“Weekend / Championship Classes” have no restrictions on the age of the horse. Weekend Classes held during an event are open to any horse or rider that meets the eligibility requirements of a given class.
And
no, the so-called weekend classes don’t necessarily have to take place on
a weekend, although Friday-Saturday-Sunday competition is by far the
most common.
Many
weekend events have begun adding LAE classes to their schedules.
But as a rule, weekend events offer some or all of the "Weekend / Championship" classes.