Improve Event::sorting_label_for to accept keys as symbols.
Improve Event::sorting_label_for to accept keys as symbols.

shawnacscott/calagator,nblackburn87/calagator,L2-D2/calagator,alexbeeken/calagator.org,bencornelis/calagator,VolunteerOdyssey/calagator,reidab/calagator,cp/calagator-1,CorainChicago/ActivateHub,cp/calagator-1,kerrizor/calagator,bencornelis/calagator,nblackburn87/calagator,Villag/dentonator,CorainChicago/ActivateHub,Villag/dentonator,kerrizor/calagator,bencornelis/calagator,matthewkmayer/calagator,matthewkmayer/calagator,iamBalaji/Calagator,bencornelis/calagator,alexbeeken/calagator.org,reidab/calagator,oktober/calagator,iamBalaji/Calagator,shawnacscott/calagator,oktober/calagator,L2-D2/calagator,kerrizor/calagator,jmcduffie32/calagator,reidab/calagator,jmcduffie32/calagator,CorainChicago/ActivateHub,jmcduffie32/calagator,CorainChicago/ActivateHub,dudleysr/calagator-workspace,Villag/dentonator,L2-D2/calagator,kerrizor/calagator,L2-D2/calagator,dudleysr/calagator-workspace,jmcduffie32/calagator,matthewkmayer/calagator,cp/calagator-1,VolunteerOdyssey/calagator,eeeeeean/windchimes,cp/calagator-1,iamBalaji/Calagator,eeeeeean/windchimes,oktober/calagator,iamBalaji/Calagator,nblackburn87/calagator,reidab/calagator,shawnacscott/calagator,VolunteerOdyssey/calagator,Eugator-Wranglers/calagator,matthewkmayer/calagator,oktober/calagator,shawnacscott/calagator,Eugator-Wranglers/calagator