Thank you Fred for reminding us that story. But "before Palm Sunday", it rather was last saturday. 
Here in Serbia, we celebrate Lazarus Saturday today.

The explanation is that many Orthodox churches still follow Julian calendar, and this year Easter is one week later than in western churches. That is, not tomorrow, but next week.
I had never heard of Lazarus saturday before, though I try to be a good Catholic as much as possible. 
See, The linked article starts with
Lazarus Saturday in Eastern Christianity
So, it seems that only Eastern Christianity celebrates it; not so strange you didn't know it until now.
I wish you happy Easter tomorrow!