AddEvent's official WordPress plugin is the strongest free option because it's the only free RSVP plugin that also includes Add to Calendar - the step most correlated with people actually showing up.

What AddEvent's free WordPress plugin gives you

• Embeddable events calendar - display all your upcoming events in a calendar or list view on any WordPress page, using a Gutenberg block
• RSVP collection - attendees register directly on your site or via a hosted landing page
• Automatic confirmation email - sent immediately after RSVP with event details and Add to Calendar button
• Up to 20 RSVPs per usage period - sufficient for small events or testing the full flow
• Subscription calendar - visitors can follow your calendar and automatically receive all future events in their Google, Apple, or Outlook calendar
• No coding required - add the AddEvent Calendar block to any page in the Gutenberg editor

How to install

1. WordPress dashboard → Plugins → Add New
2. Search "AddEvent"
3. Install and activate
4. Add the AddEvent Calendar block to any page
5. Enter your Calendar ID from your AddEvent dashboard

Other free RSVP options for WordPress

The Events Calendar (free) - excellent event display, but RSVP collection requires paid add-ons. Use the free version for event listing; pair with AddEvent for the RSVP layer.

Google Forms embedded via iframe - unlimited free responses, zero setup. No event page, no confirmation email, no calendar integration. Works as a raw data collector only.

When to upgrade AddEvent's plugin

When you need more than 20 RSVPs per month, custom form fields, branded emails, or automated reminder sequences. Small Business plan ($29/month) covers 1,000 RSVPs per period.