France's Bastille Day on July 14 faces intense heat.
Heat warnings led to the dropping of sky‑rockets and community dances in Melun and Cachan.
In Nice, ceremonies include a memorial in memory of the tragedy.
The troop procession on the Champs-Élysées without the usual registration system.
For the new precedent, Ukrainian troops will march together with French forces.
Visitors can watch the procession from the boulevard no reservation needed.
The lineup additionally includes troops from French overseas bases and veteran units.
Officials warn heat may affect later events.