Catholics must receive the Eucharist at least once per year during the Easter season.
Catholics are required to receive Communion once a year between the liturgical time period surrounding Easter.
The frequency of receiving the Eucharist varies by individual and denomination. In the Roman Catholic Church, it is recommended to receive the Eucharist at least once a year during the Easter season, but Catholics are encouraged to receive it more frequently, ideally at every Mass attended. Other Christian denominations may have different guidelines or practices regarding the frequency of receiving the Eucharist.
Catholics are required to receive Holy Communion at least once a year between the First Sunday of Lent and Trinity Sunday. This is basically the liturgical time period surrounding Easter, thus it is called "Easter Duty".
Catholics in Poland celebrate Easter the same way as any other Catholics, by going to Mass, the Easter Vigil if they can manage it.
Those things are sometimes done at the Easter Vigil.
If you attend a Saturday evening Mass, that counts as fulfilling your Sunday obligation. A Saturday morning or mid-day Mass does not. No, the Mass after dark on Holy Saturday (the Easter Vigil) is Easter "Sunday" Mass and fulfills your obligation. --- Because of the central importance of Easter to the Christian faith, the Catholic Church requires that all Catholics who have made their First Communion receive the Holy Eucharist sometime during the Easter season, which lasts through Pentecost, 50 days after Easter. (They should also take part in the Sacrament of Confession before receiving this Easter communion.) This reception of the Eucharist is a visible sign of our faith and our participation in the Kingdom of God. Of course, we should receive Communion as frequently as possible; this "Easter Duty" is simply the minimum requirement set by the Church.
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Usually those sacraments are done separately, but they can be done together, often at the Easter Vigil.
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Catholics participate in the seasons of Lent and Easter by going to church and fasting at lent.
Yes, Catholics may have a party on Easter Monday. They are free to even have a party on Easter Sunday if they have taken care of their obligation to assist at Mass that day.
No. Al Christian denominations celebrate Easter.