Since MySQL v.5.5.29 the mysqldump command can generate the following error:

-- Warning: Skipping the data of table mysql.event. Specify the --events option explicitly.

An example of mysqldump for full dumps is this:

mysqldump --opt -u <USERNAME> -p<PASSWORD> --all-databases | gzip > full_dump.sql.gz  

In a case of a server which executes it during periodical backups, this means a warning email from Cron Daemon, very annoying.

If you add, as suggested, the --events option you can receive this error:

mysqldump: Couldn't execute 'show events':  
  Access denied for user '<USERNAME>'@'localhost' to database '<DATABASE>' (1044)

The solution is to grant the EVENT permission to the user:

GRANT EVENT ON <DATABASE>.* to '<USERNAME>'@'localhost' with grant option;  

Apparently if you don't care about events there's no way to suppress the error message with some --no-events option, as far as I know.
There's an interesting discussion about this (maybe-not-a-)bug here

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