convocate or convoke?

three student-age men, rictus-grinned, their chests plastered with the serene visage of the last governor of hong kong; a septuagenarian lady plummily offering ‘badges for bingham, english or latin’; the man from the torygraph sent to run an exit poll, sweating in his tweeds under the unbroken blue of a goodbye-hilary sky; distractedly tripping over ex-cabinet ministers who choose to loiter outside bookshops: oxford cultivates its own, most idiosyncratic insanities.