Expecting the Unexpected?: the UK & the 2019 European elections

With the UK now participating in the European Parliament elections, commentators have touted them as second referendum on Brexit. But what will mobilise voters to turn out, and what should we expect from the outcome? Will an anti-EU block emerge as the new political force, or will younger, pro-Europeans mobilise around an optimistic and progressive vision for Europe? and what does the result mean for the of Europe?