Find out if you require a visa to enter Japan by visiting the Ministry of Foreign Affairs website.
https://www.mofa.go.jp/j_info/visit/visa/short/novisa.html
You'll need to check the list of the countries that have the visa 
			exemption agreement with Japan. If your country is included in the 
			list, then you will not be required for a visa when entering Japan 
			under normal circumstances. If your country is not included in the 
			list, you'll need to obtain a short-term stay visa from the embassy 
			of Japan in your country.
			
			Please read the Japanese visa guide provided by the ministry of 
			foreign affairs carefully. And be informed that it is the embassy of 
			Japan in your country that makes a decision on issuing a visa. 
			Whether the attendees need Letter of Invitation fully depends on the 
			relations between countries. The conference organizers hereby 
			reiterate that we are neither able to nor authorized to decide the 
			relations between countries.
			
			For more details, please visit: 
			http://www.mofa.go.jp/j_info/visit/visa/index.html.
			
			
			Invitation Letter
			Please note the organizing committee of the conference is not 
			authorized to assist with the VISA process beyond providing the 
			Invitation Letter. Should your application be denied, the organizing 
			committee of the conference cannot change the decision of the 
			Ministry of Foreign Affairs, nor will the organizing committee 
			engage in discussion or correspondence with the consulate or the 
			visa center on behalf of the applicant.
			
			The invitation letter will be issued upon request after the 
			successful registration.
			
			Letter of Invitation is an official document which confirms a 
			registration payment and extends an official invitation to the paid 
			registrant to attend and participate in the upcoming conference. It 
			provides you with an official reason to come to Japan. It may be 
			required for visa application if you are from a country that does 
			not have a visa exemption agreement with Japan.
			
			In order to qualify for a Letter of Invitation, you must meet both 
			of the following criteria:
			Be a registered author of an accepted full paper or abstract
			Have paid the conference registration fee.
			Letter of Guarantee is a letter in which an individual or 
			body agrees to be legally and financially responsible for you during 
			your stay in Japan. You may know a willing individual or institution 
			in Japan who is willing to act as a guarantor, or, if you have no 
			connection with the country, the Japanese Ministry of Foreign 
			Affairs may find that it is acceptable to have your university act 
			as the guarantor. Kindly note that the conference organizer cannot 
			provide Letters of Guarantee.
The weather in early December is still relatively cold, with average daily temperatures between 1-12 °C (34-54 °F).
https://www.accuweather.com/en/jp/osaka-shi/225007/december-weather/225007?year=2023
https://www.holiday-weather.com/osaka/averages/december/
The following websites provide useful information to plan for your travel within Japan.
Kansai International Airport (https://www.kansai-airport.or.jp/en/)
Travelling Kansai Using Osaka as a Base (https://osaka-info.jp/en/information/around-kansai/)
Kyoto Official Travel Guide (provided by Kyoto Convention Bureau) (https://kyoto.travel/en/)
Japan Travel Guide (JNTO) Japan National Tourism Organization (https://www.japan.travel/en/)
West Japan Railway (https://www.westjr.co.jp/global/en/)
Please note ICSeB conference and the organizing committee of the conference are not authorized to assist with the VISA process beyond providing the Notification of Invitation Letter issued by ICSeB Conferences and Conference Committee Board. Should your application be denied, ICSeB Conferences and the organizing committee of the conference cannot change the decision of the Ministry of Foreign Affairs, nor will ICSeB Conferences and the organizing committee of the conference engage in discussion or correspondence with the MOFA or the Embassy on behalf of the applicant. The registration fee cannot be refunded when the VISA application of an individual is denied. But you can join the conference online after providing related materials.