Do I need an account to join?

No. The link in your invitation is all you need. You will be asked for a display name so the other people in the room know who they are talking to.

From the guide Booking a Call About Custom Pricing.

Joining the call

The room opens 15 minutes before the start time and stays open for 30 minutes after the scheduled end. Open the link, check your camera and microphone, type the name you want shown, and join. You will wait briefly in a lobby — nobody can see or hear you until the host lets you in.

Read the whole guide: Booking a Call About Custom Pricing

More questions about Booking a Call About Custom Pricing

• How do I know my camera and microphone will work?
• Are the captions private?
• Which time zone is the calendar in?
• What if nobody lets me in?
• Is the call recorded by default?
• Where does the video go?
• Will it be in my calendar?
• Can I move the call instead of cancelling?
• Nothing is available in the calendar — what now?