puzzle problem.

Hello, trying to solve this problem for academic conference we are planning.

- Attendees are divided equally into 8 groups (A-H).
- Each group attends 4 workshops (1-4) through the course of the day, one after the other, in no specific order.
- The groups are paired with 2 groups in each workshop.
- Groups attend one workshop at a time and must attend all four workshops.

There are 28 possible group pairing combinations and 16 workshops (four workshops taking place simultaneously for four times through the day).

Is it possible to for each group to move through each workshop without being paired with the same group twice?

The closest we've come is one repeating session through the day.

Any help would be much appreciated.

Thank you!!
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