More than 10 is difficult because large numbers mean less sharing for each person. Divide large groups into small subgroups of 4 to 5. Allow up to half an hour for most of the acitivites. For example you may want to use one sharing activity and one Bible activity in an hour's session. Meeting in homes, informally, is ideal but anywhere will do.
Home groups provide an excellent setting for relating together.
Many of these activities can also be used with congregations such as in creative worship, family services, youth meetings or an informal evening service. Be positive and encouraging. Avoid unkind comment. These activities can create an atmosphere of openness and acceptance. Then lives are changed.