LOS ANGELES — L.A.'s plan to host the 2028 Olympic and Paralympic Games was already facing a thorny set of challenges, including the scramble to secure lucrative sponsorships and the search for buses to shuttle athletes and spectators across the region.

Now, organizers could soon be faced with yet another threat: a proposed ballot measure that, according to city officials, could force at least five Olympic venues to go before voters for approval.

Unite Here Local 11, which represents hotel and restaurant workers, filed paperwork in June for a ballot measure requiring L.A. voters to sign off on the development or expansion of major "event centers" such as sports arenas, concert halls, hotels and convention facilities. The measure takes aim not just at permanent projects but also temporary

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