Why the need to demonstrate? Because that's what they are good for. They were created for creating unnecessary and provocative inconvenience.
From legal firm Skrine,
RECOURSE FOR THE VANQUISHED.
The results of an election can only be challenged by an election petition which must be submitted within 21 days from the date of the election results being gazetted.
An election petition is heard in a High Court which is convened as an election court. The hearing of the petition is to be completed within 6 months from the date on which the petition is presented. A petitioner who is dissatisfied with the decision of the election court may appeal directly to the Federal Court.
Grounds for an election petition are as follows: bribery, intimidation or other misconduct which may affect the outcome of the election, non-compliance with election laws and regulations, acts of corruption or illegal acts committed by a candidate or his agent or ineligibility of a candidate to participate in the election
Penang has already sworn in their beloved CM, no problems there. Kelantan has already retired their Tok Guru, no problems there as well. Selangor is still in limbo for whatever reason. Maybe PAS does not trust their partners, who cheat in their own party elections id est.
Expect the usual suspects and the colour yellow or green or black.