Updates: more ticket stubs, places in London (recording studios) and above two "new" concerts. Thanks to a newly surfaced genuine (and used!) ticket stubs it seems very likely that Queen played FIVE gigs in late November / early December 1975, not just four as stated in all concertographies. The added concert was on 3rd December 1975. Also Roger has recently played drums at a special event - Festival of Speed Gala Dinner. Queen + Paul Rodgers have also revealed the official artwork of the forthcoming album.
Just press the F key while you're anywhere on QueenConcerts and you will be able to enter a search query (same as the fulltext search function on the right side of this main page).
Here you can search for any text on this huge site. This is a google search which means the results are not presented in such a nice way as in the fulltext search (see right menu) but the search is a bit more extensive.