Local authorities estimated about 1,500 people took part in the unauthorised gathering.
Damien Tarel has been sentenced to a prison term of 18 months, 14 of which were suspended.
This will be Castex's third time getting the virus, the last being from French President Emmanuel Macron.
French President Macron was Emmanuel Macron was slapped across the face on Tuesday.
Macron had approached a barrier to shake the man's hand.
No quarantine for passengers who have completed the two-week period after taking both doses of the Pfizer or AstraZeneca vaccine.
He hopes visit by French investigators to his home in Lebanon will be his first real opportunity to defend himself