calendars

calendars I have an activity which is carried out during the week and one which is carried out on weekends I created 2 calendars a classic (the one by default day absent Saturday Sunday) and a "weekend" calendar where only Saturday and Sunday are worked but how affected them to the spots?
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les calendriers

J'ai une activité qui s'exerce en semaine et une qui s'excerce en week-end j'ai créé 2 calendriers un classique (celui par défaut jour chomé samedi dimance ) et un calendrier "week-end" où seul le samedi et le dimanche sont travaillé

mais comment les affecter aux taches ? 

ok so it is impossible to attribute to a resource activities only the week and only the weekend or is there a solution?

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ok donc c'est impossible d'attribuer à une ressource des activité uniquement la semaine et uniquement le week-end ou bien y a t il une solution ?

It would be handy if a calendar could be assigned by period similar to variations in resource capacity (or extend it with the calendar).
Another solution (which would avoid manipulating resources) could be to add a calendar choice possibility to the progress section planning modes.

E.g., when it would be handy to have such posibilities:
1) If someone is for commissioning in a country with different calendar system and different holidays it is a nightmare to use manual planning (or there is a shortcut to mark multiple days at once and not single days) .

2) Currently all this Corona quarantines. Sepending on traveling dates they start/end on weekend days you want to set to set 14 days but you need to know exactly the capacity and everything.

3) if someone has to work on different shift for a certain time. e.g. August to November only on 3 days, in june on weekends etc.