# Event Subgroups and Event Rules

> When registering for an event, many have different subgroups you can select from, usually based on your pace group (wkg) or Racing Score. However, event...

Source: https://support.zwift.com/en_us/event-subgroups-and-event-rules-S16xjbsXs

Last updated: 2025-07-02T23:55:55.630Z

# Event Subgroups and Event Rules

When registering for an [event](https://www.zwift.com/events), many have different subgroups you can select from, usually based on your [pace group](https://support.zwift.com/category-enforcement-pace-groups-rkhtvQuqT) (w/kg) or [Racing Score](https://support.zwift.com/en_us/racing-score-faq-BkG9_Rqrh). However, event organizers may use different criteria for certain events.

## Event Rules

Event rules are intended to be used to provide a fair race environment for Zwifters of all levels. If an event has an event rule turned on, you'll see one or more of the following icons displayed:

  

Icon

Event Rule

Description

![Category Enforcement Icon](https://zwiftdmz-marcom-us-east.s3.amazonaws.com/support/EN/Cycling/Resources/Images/Category%20Enforcement.png "Category Enforcement Icon")

Category Enforcement

[Category Enforcement](https://support.zwift.com/en_us/category-enforcement-faq-rJ5CQrpvc) identifies the best minimum category for Zwifters to join based on different factors such as historical power data—[pace group](https://support.zwift.com/category-enforcement-pace-groups-rkhtvQuqT)—or [Racing Score](https://support.zwift.com/en_us/racing-score-faq-BkG9_Rqrh). Category Enforcement prevents Zwifters from joining a category that's too easy for them.

![Heart Rate Monitor Required Icon](https://zwiftdmz-marcom-us-east.s3.amazonaws.com/support/EN/Cycling/Resources/Images/Heart%20Rate%20Monitor.png "Heart Rate Monitor Required Icon")

Heart Rate Monitor Required

A heart rate monitor must be [connected](https://support.zwift.com/en_us/connecting-a-heart-rate-monitor-Hk0MimWlS) to Zwift before you can sign up for the event. The heart rate monitor must also remain connected during the event.

![Power Meter Required Icon](https://zwiftdmz-marcom-us-east.s3.amazonaws.com/support/EN/Cycling/Resources/Images/Power%20Meter.png "Power Meter Required Icon")

Power Meter Required

A power meter—such as a direct-drive trainer, power meter pedals, or a power meter hub—must be [connected](https://support.zwift.com/en_us/pairing-a-power-meter-Bk7hoXWlS) to Zwift before you can sign up for the event. The power meter must also remain connected during the event.

![Steering Required](https://zwiftdmz-marcom-us-east.s3.amazonaws.com/support/EN/Cycling/Resources/Images/Steering%20On.png "Steering Reqiured")

Steering Required

A Zwift-compatible steering device—such as the [Zwift Ride](https://us.zwift.com/collections/all/products/zwift-ride-smart-frame?variant=45155438035200) or [Zwift Play](https://us.zwift.com/collections/training-accessories/products/zwift-play?variant=43737779896576)—must be connected to Zwift to join the event.

![Women Only Icon](https://zwiftdmz-marcom-us-east.s3.amazonaws.com/support/EN/Cycling/Resources/Images/Women%20Only.png "Women Only Icon")

Women Only

The event or sub group is open to women only.

![zPower Only](https://zwiftdmz-marcom-us-east.s3.amazonaws.com/support/EN/Cycling/Resources/Images/zPower%20Only.png "zPower Only")

zPower Required

A [zPower](https://support.zwift.com/en_us/zpower-setup-r1XjaXbxr) device—such as a wheel-on trainer with a speed sensor or power meter—must be paired before you can sign up for the event. The zPower device must also remain connected during the event.

Ride On.

\-The Team at Zwift