Do you check for Rifts when you draw the initial Mythos Card (before the 1st turn begins)?

And by "checking for rifts" you mean? If it's "do you add a rift progress marker to a rift track while resolving the setup Mythos", then yes, you do

And by "checking for rifts" you mean? If it's "do you add a rift progress marker to a rift track while resolving the setup Mythos", then yes, you do

Thanks, Julia, that's what I wanted to find out.