If your MySQL backup tool or self-written script complains about an event table than you have run into an issue caused by newer MySQL versions (>5.5.30) that introduced a new table "events" in the internal schema. If you run into this you need to decide wether you want to include or exclude the new events table when dumping your database. To skip: Due to a MySQL bug #68376 you have two choices. You can check documentation and add the logical option
which will cause the event table not to be exported. But the warning won't go away. To also get rid of the warning you need to use this instead:
--events --ignore-table=mysql.events
And of course you can also choose just to dump the events table: Add the option
to your "mysqldump" invocation. If you use a tool that invokes "mysqldump" indirectly check if the tool allows to inject additional parameters.