The Palace of Versailles, the Grand and the Petit Trianon are closed. 
You may choose a ticket online.  

The park of Versailles, the lake of the Swiss Guard and the Estate of Marly are open to walking from 8 a.m. to 6 p.m. 
Access to the Park is possible by the Queen's gate, the Saint Anthony gate and the Sailors gate
Conditions to access the estate of Versailles.

There are no events at the moment.