Dorna has released its provisional 2020 MotoGP Calendar which includes a date change for the Thai GP and the inclusion of the new race in Finland. 
Begin Press Release: 

FIM Grand Prix World Championship

2020 provisional Calendar, 28 August 2019
08 March Qatar Losail International Circuit*
22 March Thailand Chang International Circuit
05 April Americas Circuit of the Americas
19 April Republica Argentina Termas de Rio Hondo
03 May Spain Circuito de Jerez ? Ángel Nieto
17 May France Le Mans
31 May Italy Autodromo del Mugello
07 June Catalunya Barcelona – Catalunya
21 June Germany Sachsenring
28 June Netherlands TT Circuit Assen
12 July Finland KymiRing**
09 August Czech Republic Automotodrom Brno***
16 August Austria Red Bull Ring-Spielberg 30 August Great Britain Silverstone
13 September San Marino e della Riviera di Rimini Misano World Circuit Marco Simoncelli
04 October Aragón MotorLand Aragón
18 October Japan Twin Ring Motegi
25 October Australia Philip Island
01 November Malaysia Sepang International Circuit
15 November Comunitat Valenciana Comunitat Valenciana-Ricardo Tormo
* Evening ** Subject to FIM Homologation *** Subject to the Contract

About the FIM (www.fim-live.com)
The FIM (Fédération Internationale de Motocyclisme) founded in 1904, is the governing body for motorcycle sport and the global advocate for motorcycling. The FIM is an independent association formed by 111 National Federations throughout the world. It is recognised as the sole compet...