Update: October 21, 2020

European Union countries have agreed to reopen EU borders from 1 July to travellers from a list of 15 countries.

Since then this list has been revised several times to 11 countries in August 2020. Then to 9 countries since October 21, 2020 (presumably in effect as of November 1, 2020):

Right now, in order to travel, it is up to everyone to analyze the situation according to their situation, including:

• Insurance: Are you covered for your travels by your group or private insurance, whether in connection with COVID-19 or for any other medical emergency? Check with your insurer. More info in this article.
• Entry requirements: each country has its own regulations. Some will only let in nationals or bi-nationals, others will require a negative COVID-19 test.
• Requirements upon return to the country: only permanent residents and Canadian citizens can return to Canada at this time. If you are in Canada on a Visa, it is not advisable to leave the country.
• A possible quarantine on your return: at this time, if you return to Canada from abroad, you will have to self-isolate for 14 days.
• Changes: as the situation is still unstable, some borders may close and flight options may become more restricted.

So take all this into consideration before moving forward.