Getai performances and other forms of stage performances and entertainment are not allowed before, during or after election rallies, said the police in a statement on Friday.
Seventh Month Festival event organisers should also ensure that no speeches intended to canvass support for election candidates or political parties are delivered.
This is stipulated under the Public Order (Election Meetings) Regulations 2009.
In addition, outdoor rallies for the upcoming General Election should be held only at designated rally sites, which the police will "make available sufficient rally sites".
Rally sites will be allocated by the ballot method previously used in the 2012 and 2013 by-elections.
The police added that a 'give-way' rule will be implemented to ensure that contesting parties/independent candidates have more opportunities to use their preferred rally sites on their preferred dates.
Parties that have been allocated a site will have to 'give way' to other applicants who have applied for the same site at the same time slot on the following day.
To ensure that every contesting party/independent candidate in each constituency can hold at least one outdoor rally within the last two to three nights of campaigning, a 'block ballot' method will be used in constituencies where the number of contesting parties/independent candidates is greater than the number of election rally sites.
Under the 'block ballot' method, the last two to three nights for rally sites will be grouped together for application as a block. Contesting parties/independent candidates can only apply for one site on one night within the block.
The allocation of outdoor assembly centre sites on Counting Night will also be done via ballot.
Details on the application and allocation process for rally sites and assembly centre sites will be released after the Writ of Election is issued.
The lunar Seventh Month Festival begins on Friday.