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2023 came when everyone on the band was still in bubbles though, or at least with a degree of caution, wasn't it? 

No, their EU tour starts in early June. They're not staying in Europe for more than two months...

Rocket Lounge and Deluxe Diner are both trusty standbys for live acts and non-dnb in the SE Corner.  The latter doesn't actually serve food at night.

Could Weezer show up? They are touring Europe in July. Would they headline?

I'd personally move rocket lounge/deluxe diner into Avalon in place of some of the current food stalls if I was looking to make more space for Shangri-la/SE corner stuff.    Then when Avalon stage ends rocket lounge can start up. The diner guests can be treated to music whilst they eat.