The getNetworkEvents call can get you L7 blocks and content/security blocks for a specified network. Note that L3 firewall hits aren't available from this call.
There are a lot of event types, you probably will want to fetch only those of interest, you can get the list of possible event types using the getNetworkEventsEventTypes call, then choose the ones you want to use to filter results from the getNetworkEvents call, fwiw I use these filters...
productType="appliance", includedEventTypes = ["nbar_block", "cf_block", "sf_url_block", "sf_binary_block"]
There is also getNetworkApplianceSecurityEvents which gets some other classes of events, I suggest run it for a while to see what you get that you want to include.
For L3 firewall events, you can get them via syslog... https://documentation.meraki.com/General_Administration/Monitoring_and_Reporting/Syslog_Event_Types_...