Rallies have taken place in the Volga region and the Urals, and are happening right now in central Russia.
Ufa:
Yekaterinburg:
Samara:
Nizhny Novgorod:
Penza:
You can watch the livestream here:

But if you live in central Russia, put the livestream aside, leave your home, and join the protest in your city.
In St. Petersburg, the rally began at 2:00 p.m. at Lenin Square. This is what it looks like there now:
And this is what it looks like in Moscow right now:
Join in.