The measures would receive statewide votes in 2016 if lawmakers do not act.
If lawmakers rejected the bill or took no action, it would receive a statewide vote in November 2016.
Mayor Virg Bernero says he’s not worried about the political risks of appearing at this weekend’s pro-marijuana rally.
The measure would allow residents 21 and older to legally possess or transfer up to an ounce of marijuana on private property.
Supporters of marijuana decriminalization have submitted petitions to place the issue before voters in two northern Detroit suburbs.