Keep in mind that these kinds of events are relatively small and that big advertisement campaigns aren't necessary. In today’s world however, there are a considerable amount of free and nevertheless ingenious ways to successfully promote your event. The majority of these promotion tools will probably already be familiar to you, here a short list to freshen the memory.
Facebook events
Posting the event details on Facebook is a very basic, still effective way to get the attention of a lot of people. However, you can make it is as elaborate as you want. Posting in Facebook groups with international students can largely increase the number of visitors. Try to find groups with an international audience, chances are there are a lot of people eager for a language exchange!
Twitter events
Other ways of promoting
Besides social media there are multiple other ways to promote your event, think of word-of-mouth marketing. Going to a nearby university is another way of effective promoting, oftentimes there are international students who would be fond of learning or practicing a new language!
Congratulations! You’re all set to organize your own language exchange!