good evening. I like to ask. I know and have seen many listings of cycling events in these areas.

For both Road bike and Mountain bike.

I like to ask what would be the most top citizen events that are good to attend.

I am looking for events that usually attract lots of people.

The events are of either road or MTB event or races.
Open to everyone.

They can be based on really long distance or time, so more less endurance events. like 24 hour events

OR in plan general just a normal traditional mtb race, that just last a few hours even. but want to find a list of the events that are quite popular.