Shropshire furniture maker Henry Addison patented these “elevators” in 1902:

My invention has for its object a new or improved device or stand for attaching to the foot by means of which those people who are at the rear of, or short people who are in the midst of a large gathering or crowd are enabled to easily and comfortably see over the heads of the people in front thus enabling them to witness a procession or game or other sight without any inconvenience or crushing which will be found of considerable advantage.

Addison thought they’d be particularly valuable at football matches, race meetings, sports, “or games of any kind where a crowd of spectators are assembled.” Of course, the people behind you will have to get stilts.