Performance: The specified page could not be loaded. Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding - when opening event records.

When a user is a member of several sites they will receive a timeout error when attempting to load events that are tied to multiple sites.  If the event is not tied to a specific site or only one site the error does not occur.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch. 

Environment

 2.93.2034.18
 2.94.1524, patch 20 ; 2.93.2034, patch 39

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