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Learn PolishHello Ania, thanks for next Polish language questions 😀
Regarding plural form for Polish days of the week, they are:
poniedziałki Mondays
wtorki Tuesdays
środy Wednesdays
czwartki Thursdays
piątki Fridays
soboty Saturdays
niedziele Sundays
weekday and weekdays are dzień tygodnia and dni tygodnia but this can mean also Saturday or Sunday (is weekday a day from Monday to Friday? I do not know myself...)
Regarding weekend/weekends singular and plural, they are:
weekend - weekend
weekendy - weekends