Need an online calendar for meeting confirmations - who has come across?

Question

Calendar

Good day to all!
Maybe someone has already come across, you need an online registrar \ calendar \ service \ or something else to book a meeting time.
Let's explain with an example.
There is a big exhibition coming up soon, our CEO wants our partners to be able to book time for a business talk at this exhibition. The partner must go through the link to the online registrar\calendar\service\etc, indicate his full name, company and select the day and time. And the time for him would be booked. And when another partner came in, he was shown the remaining free time.

Answer 1

Frosty 87 Thank you for the answer, but alas, all these systems have already been tested by me and did not bring the desired results, it’s quite dreary to look, it turns out that the partner will not be able to just go to the link and choose the time and drive in the name of the organization, in the beginning he needs to send an invitation to system and only then he can do it.

Answer 2

Look at these, they can be used as task managers or calendars
https://www.bitrix24.ru/
https://megaplan.ru/
www.freshoffice.ru
https://www.amocrm.ru/
www.sugarcrm.com
https ://www.google.com/calendar/

Answer 3

test this doodle.com/en/. Perhaps it is the most

Answer 4

UberConference https://www.uberconference.com (generally for calls, but you can just sign up there, not call)