What it means
Reporting an unwanted event as spam tells Google about that invitation and can remove it from your calendar. Blocking an organizer is a broader account action intended to prevent future invitations from that Google Account. Google says the block also affects other products such as Chat, Drive and Photos. Existing invitations may remain until you remove them separately. For a non-Google sender, email controls may be needed instead.
A real-world example
A scammer sends one fake invoice invitation. A spam report is a proportional response. If the same Google Account repeatedly sends abusive events, a block may help, but it could also interfere with legitimate file sharing if you accidentally block a real colleague.
What to do
Check the exact organizer, report the malicious event using Calendar's native control and save evidence if needed. Use Block only after reading its scope and verifying the account. Separately change invitation settings if unsolicited events keep appearing from new senders.
The distinction that matters
A spam report does not reverse a password entered on a linked site, and a block is not a guarantee that the person cannot reach you through another account or service. Blocking a contact can have cross-product effects, while merely deleting one event does not train abuse detection or stop future invitations. If the calendar item came from a subscription rather than an organizer's invite, locate and unsubscribe from that calendar instead. Never trust a phone number or link inside the suspicious event as a verification channel.
Google Calendar block and report behavior
