What's the meaning of sentence 'it's only on for those two evenings.' I don't understand the meaning of sentence 'it's only on for those two evenings.' and it's in the following paragraph. "If you're interested in classical music, then we recommend you go along to the National on either Monday or Tuesday evening at 7.30 for a spectacular production of 'The Magic Flute'-probably the most popular of all Mozart's operas. It's in the Garden Hall and tickets start at only $8.00, but you'll have to be early if you want to get them that cheap! And remember, it's only on for those two evenings."