Similar to MDL-32630 but for mod_hotpot, when upgrading to 2.2 from 1.9 I get the following error:

Sorry, but you do not currently have permissions to update calendar event

More information about this error
Stack trace:

line 435 of /lib/setuplib.php: moodle_exception thrown
line 2009 of /calendar/lib.php: call to print_error()
line 1440 of /mod/hotpot/lib.php: call to calendar_event->update()
line 1305 of /mod/hotpot/lib.php: call to hotpot_update_events()
line 656 of /mod/hotpot/db/upgrade.php: call to hotpot_refresh_events()
line 540 of /lib/upgradelib.php: call to xmldb_hotpot_upgrade()
line 271 of /lib/upgradelib.php: call to upgrade_plugins_modules()
line 1437 of /lib/upgradelib.php: call to upgrade_plugins()
line 269 of /admin/index.php: call to upgrade_noncore()

I believe this is due to the bug in MDL-32631