Zambia

WE, THE PEOPLE OF ZAMBIA:
…
CONFIRM the equal worth of women and men and their right to freely participate in, determine and build a sustainable political, legal, economic and social order; … (Preamble)

It is recognised and declared that every person in Zambia has been and shall continue to be entitled to the fundamental rights and freedoms of the individual, that is to say, the right, whatever his race, place of origin, political opinions, colour, creed, sex or marital status, but subject to the limitations contained in this Part⁸, to each and all of the following, namely:
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b. freedom of conscience, expression, assembly, movement and association;
… (Art. 11)

1. Except with his own consent, no person shall be hindered in the enjoyment of his freedom of assembly and association, that is to say, his right to assemble freely and associate with other persons and in particular to form or belong to any political party, trade union or other association for the protection of his interests.
… (Art. 21)

A citizen who has attained the age of eighteen years is entitled to be registered as a voter and vote in an election by secret ballot. (Art. 46)