diff --git a/app/controllers/rsvps_controller.rb b/app/controllers/rsvps_controller.rb
index 7a8b488..535b584 100644
--- a/app/controllers/rsvps_controller.rb
+++ b/app/controllers/rsvps_controller.rb
@@ -1,12 +1,15 @@
 class RsvpsController < ApplicationController
   def create
     @rsvp = Rsvp.find_or_create_by_email!(rsvp_params[:email])
+    Rsvp.invite_to_slack(rsvp_params[:email])
     if @rsvp.airtable_record_id.blank?
       @rsvp.update!(url_params: rsvp_params[:url_params])
     end
     redirect_to root_path, flash: { notice: "Thanks for your interest; check your email for next steps!" }
   rescue ActiveRecord::RecordInvalid
     redirect_to root_path, flash: { alert: "Please enter a valid email address." }
+  rescue => e
+    redirect_to root_path, flash: { alert: "#{e.message}" }
   end
 
   private
diff --git a/app/models/rsvp.rb b/app/models/rsvp.rb
index a3114d1..c1b5a7a 100644
--- a/app/models/rsvp.rb
+++ b/app/models/rsvp.rb
@@ -7,6 +7,45 @@ class Rsvp < ApplicationRecord
     find_or_create_by!(email: email.downcase.strip)
   end
 
+  def self.invite_to_slack(email)
+    channels = [
+      "C75M7C0SY", # #welcome
+      "C039PAG1AV7", # #slack-welcome-start
+      "C08Q1H6D79B", # #highway
+      "C08PJ6G88QN", # #highway-announcements
+      "C08S22XRYMU" # #highway-pitstop
+    ].join(",")
+
+    uri = URI("https://slack.com/api/users.admin.inviteBulk")
+    headers = {
+      "Cookie" => "d=#{ENV.fetch('SLACK_COOKIE')}",
+      "Content-Type" => "application/json",
+      "Authorization" => "Bearer #{ENV.fetch('SLACK_BROWSER_TOKEN')}"
+    }
+    data = {
+      token: ENV.fetch("SLACK_BROWSER_TOKEN"),
+      invites: [
+        {
+          email: email,
+          type: "restricted",
+          mode: "manual"
+        }
+      ],
+      restricted: true,
+      channels: channels
+    }
+    http = Net::HTTP.new(uri.hostname, uri.port)
+    http.use_ssl = true
+    request = Net::HTTP::Post.new(uri, headers)
+    request.body = data.to_json
+    response = http.request(request)
+    j = JSON.parse(response.body)
+    raise "Slack API general error: #{j['error']}" unless j["ok"]
+    raise "Slack API error: successful but no invites" if !j["invites"] || j["invites"].empty?
+    raise "Slack API error on invite: #{j["invites"][0]["error"]}" unless j["invites"][0]["ok"]
+    { ok: true }
+  end
+
   def sync_with_airtable!
     uri = URI("https://api.airtable.com/v0/appuDQSHCdCHyOrxw/tblhGTc3WX9nYzU18")