Scenario 1: Available for booking

The session may not be available for booking:

To check, in Calendar > Choose session > Modify
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Check that the option ''Available for booking (web + app)'' is activated

​Scenario 2: Reservations open

Reservations may not yet be open to the public:

From My Club > My Activities / Workshops > Modify, check that the session is open for reservations
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​More specific cases

Scenario 3: Tags

The session can have a tag and members can only register if they have this tag. If you want them to be able to see it even if they do not have the tag:

In Settings > Personalization > Calendar, check that the option ''Do not display sessions that the member does not have access to with tags'' is enabled
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Scenario 4: Workshops

You can also display workshops on the calendar for members:

In Settings > Personalization > check that the option ''Show workshops on the calendar of your members'' is enabled