While checking the logs of my web site Aérostèles I saw a link from here.
Your question about Pégoud is very intersting, then I looked in the documentation to which I have access.
According to the french aviation newspaper L'Aérophile october 1915 issue and november 1920 issue, the body of Pégoud was temporarily buried at Brasse cemetery (near Belfort) on 3rd september 1915 before a move to Paris already planned at this time. It's a request of his adoptive father Mr Crémot.
Pégoud was buried at Montparnasse cemetery on 23rd october 1920 after a ceremony at Notre-Dame. I guess the reason of this honour is because Pégoud was still very popular in France at that time.
Therefore, as this source is not always very reliable, I checked with the newspaper L'Aéronautique #17 31st october 1920 issue. Just a few words about Pégoud funeral on 23rd october 1920 followed by 100 000 people.
In addition the memorial erected at the crash site on 23rd september 1917 has been moved to the center of the town Petit-Croix on 15th may 1982 because it was isolated in the country.