Number is not reliable because it is allocated from the order events are precache, and as some events are precache when entities are spawned, it depends on map.
Code:
events/wpn/tf_sg.sc 1
events/wpn/tf_sgreload.sc 2
events/wpn/tf_sgpump.sc 3
events/wpn/tf_axe.sc 4
events/wpn/tf_axedecal.sc 5
events/wpn/tf_knife.sc 6
events/wpn/tf_mednormal.sc 7
events/wpn/tf_medsuper.sc 8
events/wpn/tf_medsteam.sc 9
events/wpn/tf_nail.sc 10
events/wpn/tf_snail.sc 11
events/wpn/tf_rpg.sc 12
events/wpn/tf_ic.sc 13
events/wpn/tf_flame.sc 14
events/wpn/tf_tranq.sc 15
events/wpn/tf_sniper.sc 16
events/wpn/tf_sniperhit.sc 17
events/wpn/tf_ar.sc 18
events/wpn/tf_rail.sc 19
events/wpn/tf_acwu.sc 20
events/wpn/tf_acwd.sc 21
events/wpn/tf_acfire.sc 22
events/wpn/tf_acsspin.sc 23
events/wpn/tf_acspin.sc 24
events/wpn/tf_acstart.sc 25
events/wpn/tf_gl.sc 26
events/wpn/tf_pipel.sc 27
events/wpn/tf_ssg.sc 28
events/misc/tf_buildingevent.sc 29
events/explode/tf_concuss.sc 30
events/explode/tf_emp.sc 31
events/explode/tf_pipe.sc 32
events/explode/tf_gren.sc 33
events/explode/tf_engrgren.sc 34
events/explode/tf_normalgren.sc 35
events/explode/tf_mirvmain.sc 36
events/explode/tf_mirv.sc 37
events/explode/tf_fire.sc 38
events/explode/tf_burn.sc 39
events/explode/tf_gas.sc 40
events/explode/tf_nailgren.sc 41
events/explode/tf_ng.sc 42
events/misc/gibs.sc 43
events/door/doorgoup.sc 44
events/door/doorgodown.sc 45
events/door/doorhittop.sc 46
events/door/doorhitbottom.sc 47
Regarding to events/ folder content, seems that misc/benchmark.sc is missing.
Either it is something for developpers, either it is not used on the map i launched to log events.