Get out your Google translate if you don't read French.
There will be several Metro closings and road closings in Paris over the next two days as the French
1) host a military parade from the Arc de Triomphe down the Champs-Elysées to the Place de la Concorde on Saturday morning;
2) have a concert under the Eiffel Tower (9:15 pm) and then shoot off fireworks from the Eiffel Tower (11 pm) Saturday night;
and
3) Watch LES BLEUS in the World Cup final Sunday evening (5 pm local - huge television screens at the Hotel de Ville and the Champs de Mars - honestly I would avoid either of these zoos; anywhere in any neighborhood will be festive enough with everyone out watching the match together).
Here's a link to the RATP (Paris transit authority) website, with its notifications of tomorrow morning's closures along the parade route (for example several stations won't even open until early afternoon)-
https://www.ratp.fr/travaux-manifestations/manifestations
and here's the link to the Prefecture of Police's page about the roads that will be closed at various times over the two days (three maps, one after the other - a.m. parade, p.m. fireworks, then Sunday World Cup). Scroll down the page a little bit to see the maps.
Basically -- if you're anywhere in the heart of town, stay flexible and aware, and know that it could take you a bit (or a lot) longer to get where you're going. Taxis/Ubers are likely to be even worse.
Check the RATP link above, France24 English news feed, and the Twitter handles of various Metro lines (e.g. @Ligne1_RATP for line 1), as well as the Twitter feed of the Prefecture de Police (@prefpolice) for updates as the weekend progresses. And enjoy all the excitement!!