It is easy to overlook some of the other First World War anniversaries in light of all the publicity given over to 'bigger' events. The website CentenaryNews.com is an excellent source of information about all of the battle anniversaries and the details of any commemorative events associated with them. It has provided a useful summary listing here.
The site regularly posts information on Twitter and Facebook, which often includes superb contemporary photos. Highly recommended as a 'follow'!