Evenium

Evenium’s plugin is tailored for professionals who seek a simple way to register and invite guests to their events directly from their websites.
Whether your website is built for single or multiple events, Evenium is the tool you need to spend less time managing your event, so you can focus more on helping your participants be more engaged and active.
In five minutes’ time, you’ll create your event, specify ticket types, build custom registration forms, customize the colors, and craft your agenda. Once you’re done, you can quickly send invitation emails to your guests, bringing them to your WordPress website where they will register and get their badges.
Our free entry management app, Evenium OnSite, will help you welcome your guests. You can check them in by searching for their names, or — even better — by scanning their QR codes.
Additionally, your participants will benefit from the free version of our powerful mobile app, Evenium ConnexMe. They will access all the information about your event in the palm of their hands, eliminating the need and cost for paper guidebooks and agendas. Your participants will also have a truly unique way to network and share with other attendees, as it is part of the core strength of our ConnexMe app.
Evenium is a comprehensive solution for managing professional events from your WordPress website. Find out more by watching the video below or visiting our website www.evenium.net
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Easily set up professional events! Integrate registration & ticketing with WP, list all your events, enjoy our free entry management app, and more

noplanman

NOTE: This plugin serves as a mini-plugin until Tsu releases an official public API.
The Tsu plugin adds a widget to place a link to your Tsu profile in your sidebar. Your readers can then easily visit your Tsu profile and use it as your invitation to the network. 
You can optionally add a name to be displayed and choose if a logo should be shown in different sizes.
Translations: 
* English, German & Spanish (<a href="https://www.tsu.co/noplanman" rel="nofollow ugc">Armando Lüscher</a>) 
* Dutch (<a href="http://tsunl.nl" rel="nofollow ugc">Elza van Swieten</a>)

Tsu widget to share your profile / invitation with your readers.

Evenium vs Tsu