You can accomplish this by creating a group policy.
Network Wide > Group Policies.
At the top of your policy, you can set a schedule for when it is enforced. And then subsequent firewall/traffic shaping rules within that policy.
On the Security Appliance > Addressing & VLANs, you can apply that policy to an entire VLAN.
Or on Wireless > Access Control, you can tie that policy to a device type such an Android, iPhones, etc.
Finally, the Network Wide > Clients page, you can put the policy on individual devices manually.
https://documentation.meraki.com/MR/Group_Policies_and_Blacklisting/Creating_and_Applying_Group_Poli...
Hope this helps! Happy to help with any further questions.