RSVP form to WhatsApp groups, calendar invites, and name badges

For local meetups I use Google Forms for RSVPs, then manually add people to WhatsApp, send calendar invites, and make name-badge CSVs. Mistakes happen when people cancel. I want: form submit/cancel, sync WhatsApp group membership (or a pending list I approve), send/update Google Calendar invite, maintain a badge CSV (name, org, dietary notes). Even a solid Zapier/Make blueprint plus one custom step would help.