The Twentieth Anniversary London Improvisers Orchestra is offering a limited number of tickets to people who wish to attend their rehearsals, which take place from 17h30-19h00 on Sunday 2 December and Monday 3 December at Cafe Oto main space, and cover the signals and structures used for conducted and composed improvisations. Ticket holders must bear in mind that the orchestra will be preparing for their evening performances, and that it requires absolute quiet for the rehearsals. No food or drink will be served.