Could you let me know when you did the upgrade to Events 5.2.2, because this fix should be included?

Run this SQL in the Host/SQL dialogue.

Cheers
Rogter

IF EXISTS (SELECT * FROM dbo.sysobjects where id = object_id(N'{databaseOwner}[{objectQualifier}EventsMasterAvailableModules]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
DROP PROCEDURE {databaseOwner}[{objectQualifier}EventsMasterAvailableModules]
GO

/*** EventsMasterAvailableModules ***/

CREATE PROCEDURE {databaseOwner}{objectQualifier}EventsMasterAvailableModules
(
@PortalID int,
@ModuleID int
)
AS
SELECT @ModuleID as ModuleID, c.PortalID, 0 as MasterID, a.ModuleID as SubEventID
FROM {databaseOwner}{objectQualifier}Modules a
LEFT JOIN {databaseOwner}{objectQualifier}ModuleDefinitions b on a.ModuleDefID = b.ModuleDefID
LEFT JOIN {databaseOwner}{objectQualifier}DesktopModules d on b.DesktopModuleID = d.DesktopModuleID
LEFT JOIN {databaseOwner}{objectQualifier}TabModules t on a.ModuleID = t.ModuleID
LEFT JOIN {databaseOwner}{objectQualifier}Tabs c on t.TabID = c.TabID
WHERE
d.ModuleName = 'DNN_Events' AND
c.PortalID = @PortalID and
a.ModuleID Not In (SELECT SubEventID FROM {databaseOwner}{objectQualifier}EventsMaster where ModuleID = @ModuleID) AND
a.ModuleID Not In (SELECT ModuleID FROM {databaseOwner}{objectQualifier}EventsMaster where SubEventID = @ModuleID) AND
a.ModuleID != @ModuleID AND
t.IsDeleted = 0
GROUP BY c.PortalID, a.ModuleID
ORDER BY c.PortalID, a.ModuleID

GO

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I was having the same problem so I upgraded from 5.1 to 5.2.2 and now I was able to choose a sub calendar and thought every was good but when I went back to the page with the sub calendar all of the events were removed from the sub calendar. It looks like the events were moved to the main calendar instead of remaining as they set up.

Did you have the same problem?
Any ideas as how to fix this?