There is no regulation about whether a proposed bylaw get a first reading or not except that petitions for a bylaw must get first reading.
Petitions for Vote of the Electors - New Bylaws Petition for bylaw
232(1) Electors may petition for
(a) a new bylaw, or
(b) a bylaw to amend or repeal a bylaw or resolution
on any matter within the jurisdiction of the council under this or >another enactment.
(2)A petition requesting a new bylaw under Part 8, 9, 10, 17 or 17.2 or >an amendment or repeal of a bylaw or resolution made under Part 8, 9, 10, >17 or 17.2 has no effect.
RSA 2000 cM-26 s232;2016 c24 s1
The requirement is here, in section 233
(3) Within 30 days after the day on which the chief administrative >officer declares a petition submitted under section 232 to be sufficient, >the council must give first reading to a bylaw dealing with the subject->matter of the petition and any other related matters the council >considers necessary.
There are regulations on things such as forbid all three readings in one council meeting unless all councilors agree, that a first reading can't take place unless all councilors have been given a chance to read the proposed bylaw (that's in sub-section 187(2)), and a proposed bylaw goes stale if 2 years passes after first reading and before third reading.
Because of 187(2), every councilor has actually had a chance to read the proposed bylaw before the first reading. As a consequence they know the contents of the bylaw.