"The French Historic Grand Prix as a curtain-opener for the Formula 1 Grand Prix de France" HVM words.
If you're really interested in such an event -why not?- all info you need is on the official website. Cant imagine a single R30 drop under Lewis slicks!
Just my opinion but, sometimes, may be, some and others should worry about free translators found here, there and elsewhere.
If you're looking for the meaning of "curtain opener" you won't understand what you're missing. Ouverture de rideau or better lever de rideau is a theatrical ref. Understand support races and it'll be fiiiiine…
Comme disait ma grand mère, il y a des coups de pied au derrière qui se perdent!!!