The critical situation around the world and in Israel has generated a number of interesting piskei halacha, some of which have already been posted here. Here is another one.

Chief Rabbi Dovid Lau has paskened that anybody who has had to postpone a scheduled wedding, due to the COVID-19 crisis, will be able to have the wedding during sefiras haomer, when it is normally customary to not have weddings. Rav Lau explained that he is allowing this as a one time allowance, not for future years. Also, it will only be allowed during parts of the Omer in which some communities allow weddings (as far as I know, that would allow the entire Omer, as each part of the Omer has some people allowing weddings).

Rav Lau explains that pushing off weddings is a very difficult and damaging thing. Rav Lau says he told people not to push off the chuppa but to hold a very small event with a small number of attendees and get married, and if necessary have a party later with the friends when the crisis blows over. He is still encouraging engaged couples to get married before the holiday. However, some cannot or will not, and the crunch time because of the Omer will cause too long a delay and therefore he has paskened to allow weddings during the Omer for affected couples.
sources: Kikar, Actualic