Like Kyber and Enigma, you can participate Aventus ICO if applying to whitelist. Here is how to do that.
Official statement of the ICO: https://blog.aventus.io/token-sale-white-list-and-other-updates-9f85ceda397
First, sign up for Aventus Slack channel,
https://slack.aventus.io/
Then fill out and send this form.
Https://docs.google.com/forms/d/1vI_kpCDiHQqVd8irai9sixBLWCH3-MakzmRz_giPCX8
Note: In the form, there is a blank to enter how much ETH you want to contribute, and it is said that when you actually contribute, you need to send the same amount of ETH as you entered in the form. Even if it is more or less, it will be rejected. So let's fill in the actual amount you can possibly send.
That's it. We just wait to pre-sale to registrants start on September 5, the day before September 6 when ICO starts. So we have to complete the contribution in 24h.
The whitelist deadline is until 17:00 UTC on 28th.
Pre-sale to Whitelist registrants is 24 hours from 12:00 UTC on September 5.
KYC (personal identification registration) was not mentioned.
Good luck!