Contractor newbie question - uplift for weekend work?

[clived]

Moving to an (IT project management) contract role for the first time. Is there a normal expectation around a rate uplift for work that needs (as defined by the employing organisation) to be carried out either out of hours during the week or on Saturday / Sunday? I'm sure the first answer will be "what does your contract say", but as it doesn't say anything about this, I want to know what the industry norm is.

Cheers!