What Lornholio and kenttaff13 said!
Only Brevent and Flegere lifts closed through July and August, so that leaves all of Le Tour (except posettes), Les Houches, Grand Montets (ish, a couple trails are off limits) then if you have the full area lift pass, St Gervais, Megeve, Combloux, Les Contamines. I think you’ll survive for the week.
I got fed up reading rubbish about the bike ban in Chamonix and wrote a rough guide to just how much you can do during July and August: http://www.chamonixbikeblog.com/2017/unintended-consequenceschamonix-bike-ban/
Or you could give Wayne a shout and get shown the stuff that doesn’t make it into any of the books…. https://www.chamonixmtb.com/