Finding Mistake After a Conference Proceedings Do conferences such as IEEE allow authors to change/update a published conference paper due to some minor issues and mistakes such as equation caption errors or footnote mistakes that do not alter or affect the actual paper's data and information?

If yes, what would be the procedure?

Regards.
Obviously you cannot change the printed version of a conference paper as soon as it has been printed. Whether or not it is possible to change the online version (or to add an errata list) depends on the publisher. Check the publisher's web site and/or contact their author support by e-mail.