I'm traveling to Basel with seven other friends in September, and was hoping to pre-arrange a local tour guide to show us around, for perhaps a half day. Any ideas or thoughts? Thanks.
The Basel tourist authority does lots of guided tours, public ones at fixed times and ones you can book for groups.
See website here: https://www.basel.com/en/Guided-Tours and then scroll down to "CITY TOURS FOR GROUPS".
P.S. I've just noticed there is a video about the tours: https://www.youtube.com/watch?v=lB8v856shlA
When I am walking around the city at the weekend I often spot these groups, with the guides for different tours speaking different languages.