Shiqaqi was first Sunni terrorist leader to find Koranic justification for suicide terrorism.
He was assassinated in a Mossad operation in Malta on October 26, 1995.
The commemorations reach their peak today with a planned rally in Gaza, to be attended by all factions and not just Islamic Jihad members. It will be broadcast on satellite TV.
The rally will emphasizes that the Palestinian Arabs support the approach of jihad and resistance, and reject any "defeatist" options or compromises that would waive what they consider their basic rights to all of Palestine.
Because the rally goes against all of Western conventional wisdom about how moderate most Palestinian Arabs are, it - and its themes - will be all but ignored by the media.
Here are some pictures from Islamic Jihad parades through Rafah and Khan Younis yesterday. (The last two pictures are dated from six months ago, so either the camera time was not set or Palestine Today is not quite telling the truth about the rallies....)