The official language of FIMS 2020 is English.  
Athens is at UTC/GMT +3 hours during the summer period.
Athens enjoys a warm Mediterranean climate and ample sunshine and is an ideal year-round destination with comfortable and favorable climate conditions for travel. The average temperature during the month of September in Athens ranges from 20°C to 29°C / from 68° F to 84° F. 
Emergency Telephone Numbers
Police: 100
Ambulance: 166
Fire Department: 199
Hellenic Coast Guard: 108
Tourist Police: 171
General Telephone Information: 11888
The electrical power supply “voltage” in Athens is: 220-240 Volts (U.S./Canada: 110-120 Volts). 
There are 4 main GSM operators in Greece that you can roam with: Cosmote, Vodafone, Wind and CYTA. The protocols for digital mobile telephone transmissions are based on GSM technology, operating at the frequencies of 900 and 1800 MHz. Please contact your provider for further details. 
In restaurants and hotels, taxis or other services, tipping is optional and customized per case depending on whether you are pleased with the service. Approximately 5% of the bill is a good guideline.