It seems a rather odd strategy to open up nightclubs only to impose a strict requirement for entry 6 weeks after you’ve opened them.
If it was an incentive to get those who haven’t already been vaccinated to get their jabs I’d understand it (only if the venues remained closed until then).
The big question for live music and theatre is what constitutes a large venue. Presumably, if nightclubs have this requirement then live music venues will too. And that could be bad news for live events.