I joined a gang that already played the Hacienda this season. If I change my team again, will I be able to participate in Hacienda?

Yes! If you haven't declared your participation this season, you will be able to do so in a new gang.

I joined a new gang but I already played the Hacienda this season. Will I be able to participate in Hacienda with my new team?

No, if you declared your participation this season already, you won't be able to join your new team in the Hacienda event. To do so, you will have to wait for the new season to start.