Traveling to Germany from other European countries can be a smooth experience, but there are some key things to keep in mind.

Schengen AreaGermany is part of the Schengen Area, which allows for passport-free travel between member countries.
If you’re traveling from another Schengen country, you generally won’t need to go through border controls.
If you’re coming from outside the Schengen area, you may require a visa.
CurrencyGermany uses the Euro (EUR). Make sure to have some Euros with you, especially for small purchases. No other currency is accepted. Credit and debit cards are widely accepted, but it’s advisable to have some cash on hand.
LanguageGerman is the official language. While many Germans speak English, especially in urban areas and tourist destinations, it’s helpful to know some basic German phrases.
TransportationGermany has an extensive and efficient public transportation system, including trains and buses. Consider purchasing a rail pass if you plan to travel within the country by train.  
Be careful: at the moment (January 2024) there are several strikes in Germany.
HealthcareMake sure you have travel insurance that covers medical expenses. European Health Insurance Cards (EHIC) may still be valid, but it’s recommended to have additional coverage.
Electrical OutletsGermany uses the Europlug Type C and Type F electrical outlets. Check if you need a power adapter for your devices.
WeatherIn the period of the Conference, during the evening and overnight hours, you’ll see temperatures dropping down to 4°C (about 39°F). If you’ll be out and about during this time, be sure to bring a jacket or coat. During the warmest parts of the day, the high temperature reaches up to 13°C (about 55°F).
Cultural EtiquetteGermans value punctuality and politeness. When in public spaces, be mindful of local customs and norms. Tipping is common in restaurants, and rounding up the bill is a common practice.
Emergency NumbersThe emergency number for police, fire, and medical assistance in Germany is 112.
COVID-19 RegulationsThere are no COVID-19 guidelines and entry requirements for the moment.

Remember to check for any updates or changes to these recommendations, as travel regulations can evolve. Always consult official government websites or contact the relevant authorities for the most accurate and current information.