We can keep eth conference cities for EL and stars for CL, but just combine them for the short upgrade names where necessary.
Suggestions:
Lontair (Londen + Altair)
Paritrix (Paris + Bellatrix)
Shapella (Shanghai + Capella)
Canubhe (Cancun + Dubhe)
Practra (Prague + Electra)
Dubhe would be my strong preference for star name after Capella: it’s the traditional/formal name for Alpha Ursae Majoris, also known as the “Big Dipper” and “Great Bear”: the ideal name to close a bear market with.
Electra would then be a great follow-up star name: Electra is a star in the Taurus constellation (bull after bear 
).