It's something happened after a almost 60 year of ban.

Source

Now its a time of celebration for women of Sri Lanka.

Women in Sri Lanka will soon be legally allowed to treat themselves to their favourite tipple, after the country’s government announced that it has done away with a law banning them from buying alcohol.

• Female drinkers have been left parched on the island nation since the passing of a law banning them from buying alcohol in 1955. The amendment lifting the booze ban also means that women will, for the first time, be able to work in places that sell alcohol. The measure’s passing was announced by Mangala Samaraweera, the Minister of Finance and Media.
  Source
  May many of man still protest against this decision. But I an act equal right for women and it's legal for women to work in bar and serve drinks and also drink beer or alcohol by there choice.