What has Caesar declared for the slaves that offends the tribunes, and why have the cobbler and carpenter taken holiday?William Shakespeare's...

In Julius Caesar, the carpenter and
the cobbler take a day off of work to celebrate Caesar's entrance into Rome following
his victory in a civil war against another Roman general.  As the Cobbler tells Flavius
and Marullus:

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...we

make holiday
to see Caesar and to rejoice in his

triumph.  (Act
1.1.33-35)

Flavius and
Marullus are upset by this, they say, because Caesar has only defeated another Roman,
not conquered an enemy.  They want to know who Caesar brought back to Rome who will pay
monetary tribute to the city after having been conquered.  The implied answer is no one,
of course, since it was only a civil war.  The two chase away the commoners and "disrobe
the images" (line 69), or take off the ceremonial scarves honoring Caesar from Rome's
statues.

I'll let another editor handle what happens to
Flavius and Marullus because of their actions, if that's what you're asking.  There are
no slaves in the opening scene, though.  The cobbler and the others are commoners, but
they're not slaves, and Caesar doesn't do anything to them.  Flavius and Marullus are
the ones who are punished.