A text based around Ramadan to practise E3 -L1 English reading in detail / skimming & scanning for information.
There is also a related form filling exercise (E2-E3), dictionary work, and a discussion prompt (all levels)
The letter-writing task focuses on charity, so it could also tie in to employability qualifications if you are teaching community project modules or similar.
Three differentiated writing tasks / practice papers on the same theme. First, you apply to appear in a Christmas Concert at the village hall. Later, you hear you have got a place in the concert and write an email inviting your friends to come and watch.
I wrote these tasks as an informal summative assessment end-of-term activity for a mixed level E1-E3 group of 16-19 year-olds, but they are suitable for any age group.