I recall by-appointment was mentioned in the first doses too, but neverthless you could just walk in without.

Probably appointment was originally needed for schools or others potentially large groups, and extended to everyone in way that is common bureacracy here - only to be ignored in the end.

May 9-10(9:00-17:00) for second and booster shots. The English comes after the Chinese.

mp.weixin.qq.com/s/oOeh76jiUXG5B-bJnRTQVw

Just to update you - I got my booster this morning at Calmette - same place as before - no appointment necessary.