祭り and 行事: festivals and scheduled events
Distinguish festivals from the broader category of events, and schedules from preparation and performance.
The word for a festival
祭り, read まつり, means a festival or ritual celebration. 町の祭りに行きました。 means going to the town festival.
祭りの準備を手伝いました。 means helping prepare for the festival. It does not mean the festival is already over.
The broader word for an event
行事, read ぎょうじ, is an event held for a purpose or as part of a schedule. 学校の行事に参加しました。 means participating in a school event.
来月の行事を確認しました。 means checking next month's events. It does not mean attending them.
Category and change
A 祭り can be described as a local 行事. Do not turn every school event or examination briefing into a 祭り, however.
行事は延期されましたが、中止ではありません。 says that the event was postponed, not canceled. Distinguish a schedule change from a decision not to hold it.
Does 行事は延期されましたが、中止ではありません mean the event will not be held?
Show the answer and why
No. It says that the event was postponed but not canceled.