The Doge's Palace and other museums of the Fondazione Musei Civici are temporarily closed.
https://www.visitmuve.it/en/home/

The Peggy Guggenheim Collection is open on Thursday and Friday, 10 a.m. – 6 p.m. 
Online ticketing is mandatory.

Palazzo Grassi opens on Thursdays and Fridays from 11 to 26 February
From 10 am to 7 pm

The Accademia Gallery is open with temporary opening hours
http://www.gallerieaccademia.it/en/node/2741

Teatro La Fenice only with online streaming performances 
https://www.teatrolafenice.it/en/

The Scuola Grande of Saint Rocco is open during weekdays (Closed on Saturdays and Sundays)

Always check the official website of each museum for the last updates.
We will try to update this list regularly