If you want to know what’s going on at either Disneyland Park or Walt Disney Studios, here is the link to the current weekly park programme.
The programme lists opening hours, show and parade times and the time and locations for all official meet and greets, along with any other special events. (Please note that meet and greets in Extra Magic Hours are not listed, and that additional impromptu character meets can happen at any time, at any location around the park with no warning).
Each new programme starts on a Saturday, but is released on the link below at some time on the previous day on the Friday.
(The link takes you to a pdf file on the Disneyland Paris website. On a laptop/PC etc it should open in another tab on your browser; on mobile devices it might open automatically, or just download to your device.)
If you are staying in a Disney hotel you will usually be given a paper copy of the current park programme, along with a copy of the park map. Park programmes and maps are also readily available to all guests; just check the dispensers on the wall as you walk through from the park gates, under Main Street Station, towards Town Square.
Park programmes are usually very similar within a season (Christmas, Halloween, Frozen Summer Fun, Season of the Force, Swing Into Spring etc.). So if your holiday is a little way off, but you would like to do some planning, you can usually get a good idea at least of what might be happening from the current park programme, as long as it is within the same ‘season’.