You can either use the session-wide link, persistent links, or single-use links.

Session-wide link

If it's not practical for you to use a Room, you can distribute the following link to participants.

https://multiattributetask-1d8be898f1f5.herokuapp.com/join/mupopibe

Persistent links

For a real session, you should use a room.

Single-use links

Below are single-use links.

P1	https://multiattributetask-1d8be898f1f5.herokuapp.com/InitializeParticipant/csqrew1v
P2	https://multiattributetask-1d8be898f1f5.herokuapp.com/InitializeParticipant/zgr7m8rs
P3	https://multiattributetask-1d8be898f1f5.herokuapp.com/InitializeParticipant/59i0lfot
P4	https://multiattributetask-1d8be898f1f5.herokuapp.com/InitializeParticipant/sgkrlm89