It is possible to host a study group at a library in Johannesburg, but it will depend on the specific library and its policies regarding the use of its facilities for study groups. Some libraries may have designated areas or rooms that can be reserved for study groups, while others may not have the capacity to accommodate study groups.
It is recommended that you contact the library directly to inquire about the availability and policies for hosting a study group. Some libraries may require you to fill out a request form or to provide additional information about the purpose and size of the study group. It is also a good idea to check the library's website or to call in advance to confirm the availability of the space and any policies or guidelines that may apply.