Here's my list of the most important design conference in 2018 for designers.

January - North America 

Front  - January 4–5, 2018
Park City, Utah United States

January 7–10, 2018

GROUP 2018
Sanibel Island, Florida United States

January 13, 2018

UXCamp DC 2018
Washington DC, United States

January 15–17, 2018

Europe beyond tellerrand Munich 2018
Munich, Germany

January 30, 2018

UXZ
Prague, Czech Republic

January 29 –February 2

Elsewhere Singapore UX Conference
Singapore

February 27 –March 1, 2018

North America ✦ ConveyUX 2018
Seattle, Washington United States

February 3–8, 2018

Europe ✦ Interaction 18
Lyon, France

February 7–9, 2018

Awwwards Conference Berlin
Berlin, Germany

February 10, 2018

Krupa UI/UX Conference
Kyiv, Ukraine

February 20, 2018

The UX Conference 2018
London, United Kingdom

February 20, 2018

UXistanbul Conference 2018
Instanbul, Turkey

February 27–28, 2018

UX Copenhagen
Copenhagen, Denmark

March 5–7, 2018

North America ✦ UIE UX Immersion: Interactions
Newport Beach, California United States

March 19–20, 2018

LX: Leading Experience Conference 2018
San Francisco, California United States

March 21–25, 2018

✦ IA Summit 2018 Chicago, Illinois United States

March 8, 2018

Europe - UXinsight 2018
Utrecht, The Netherlands

March 14–16, 2018

Booster Conference 2018
Bergen, Norway

March 15–16, 2018

UX in the City
Manchester, England

March 17–23, 2018

London UX Conference
London, England

March 24, 2018

UX Camp Brighton 2018
Brighton, England

March 7–11, 2018

Elsewhere IUI 2018
Tokyo, Japan

March 8–9, 2018

Design Research 2018
Melbourne, Australia

March 9–10, 2018

UXHK 2018
Hong Kong, China

March 27–29, 2018

CHIuXiD 2018
Yogyakarta, Indonesia

April 2–4, 2018

North America An Event Apart Seattle 2018
Seattle, Washington United States

April 10–12, 2018

April 10–12, 2018Web à Québec
Québec City, QC Canada

April 14–16, 2018

UX+DEV SUMMIT
Fort Lauderdale, Florida United States

April 14–20, 2018

Washington DC UX Conference
Washington DC, United States

April 17–18, 2018

Smashing Conference San Francisco 2018
San Francisco, California United States

April 21 — August 26, 2018

CHI 2018
Montreal, Canada

April 14, 2018

Bulgaria Web Summit 2018
Sofia, Bulgaria

April 14, 2018

ProfsoUX 18
Saint Petersburg, Russia

April 23–24, 2018

Yggdrasil 2018
Sandefjord, Norway

April 23, 2018

Ergonomics & Human Factors 2018
Birmingham, England

May 3–4, 2018

XD Immersive
San Francisco, California United States

May 9–11, 2018
 

99U Conference
New York, NY United States

May 10–11, 2018

Awwwards Conference San Francisco
San Francisco, California United States

May 20, 2018

UXPA Boston
Boston, Massachusetts United States

May 29–30, 2018
 

DesignThinkers 2018 Vancouver
Vancouver, Canada

May 6–7, 2018

UX Salon 2018
Tel-Aviv, Israel

May 7–9, 2018

beyond tellerrand Düsseldorf 2018
Düsseldorf, Germany

May 17–18, 2018

UX Riga
Riga, Latvia

May 22–25, 2018

UXLx 2018
Lisbon, Portugal

May 23–25, 2018

UX London 2018
London, England

May 18–19, 2018

UXConf BR 2018
Porto Alegre, Brazil

June 8–11, 2018

North America GI 2018
Toronto, Canada