The hotel/accommodation booking for TUR2021 is guaranteed in Italian by https://www.viaggidelgenio.it/ and in English and German languages by https://activetraveltuscany.com/.
Please consider that September is still high season in Italy and Elba Island, in addition to its renowned beaches and natural beauties, offers maximum health safety on both ferries and hotels, therefore in early September a very high number of tourists coming from all over the world is expected.
Finding accommodation in Portoferraio, either close to the TUR2021 conference venue or nearby, may be very difficult if reservation is not made well in advance (preferably in April-May).