One interesting feature of MyDwoje is the calendar of singles events. You will need to fiddle around with the criteria until you find a manageable number of search results not too many but not too few. Even in eDarling you have to pay to get a membership to communicate liberally to the people who you are interested in dating. A 3- or 6- month subscription will bring that monthly price down.
If you both individuals like each other, then they can send a message and exchange them up to seven days.