MailChimp for WooCommerce Memberships lets you interact with the participants on your website more efficiently. Formerly, you had to do CSV exports for participants to get participant information set up in MailChimp, upload these exports to MailChimp, and also combine tags to be able to create effective member segments by hand modification. WooCommerce Subscriptions required for this plugin (acquired individually)

Bookly Waiting List (Add-on)
Maximize your bookings with our Waiting List add-on. Never miss out on potential appointments again by seamlessly managing your client’s availability. Save time and money with this essential tool.