You can do an exchange anytime that suits you. Just find an exchange partner to do an exchange with.
Possibilities are endless. These are just some examples
Do you need to strengthen your ability to express yourself through writing, why not exchange correspondence (email, letters)?
Your kids are spending three months in a student’s residence in the UK, why not spend a holiday week or a weekend with them staying with a local family? Can this local family then visit you at home and spend a few days with you?
It would be good for you to practice the whole family, but you don’t want it to be arduous, but to be fun, How about playing Trivia, Scrabble or any other board game that you like online with another family?
You go abroad for a long weekend, why not use those few days to stay with an exchange partner? It will be a different experience.
You have been learning languages for a long time, but it is still difficult for you to speak. What if you find a partner with whom to speak without pressure and from the informality to be able to practice and lose the fear of being wrong? Could you make a weekly video call and just chat about that hobby that you both share?
You are traveling in another country and want to spend an afternoon or go out to dinner with people there … Take advantage and meet a member of the community!
Welcome a foreign kid in your home during the Christmas holiday.
You share a hobby with your exchange partner, both fascinated by photography. Why not take the opportunity to do a photography course together? You will practice the language from your great hobby.