Below are listed Public Holidays for the January 2010-December 2011 period.
Holidays
2010
1 Jan New Year's Day.
16 Feb Mardi Gras (Carnival).
2 Apr - 5 Apr Easter.
25 Apr Freedom Day.
1 May Labour Day.
3 Jun Corpus Christi.
10 Jun Portugal Day.
15 Aug Assumption.
5 Oct Republic Day.
1 Nov All Saints' Day.
1 Dec Restoration of Independence Day.
8 Dec Immaculate Conception.
25 Dec Christmas Day.
2011
1 Jan New Year's Day.
24 Feb * Mardi Gras (Carnival).
22 Apr - 25 Apr Easter.
25 Apr Freedom Day.
1 May Labour Day.
10 Jun Portugal Day.
23 Jun Corpus Christi.
15 Aug Assumption.
5 Oct Republic Day.
1 Nov All Saints' Day.
1 Dec Restoration of Independence Day.
8 Dec Immaculate Conception.
25 Dec Christmas Day.
Note
Holidays falling on a Saturday
or Sunday are not observed on the following Monday.
http://www.worldtravelguide.net/country/227/public_holidays/Europe/Portugal.htm