Migration to version 15.0

[OCA-git-bot]

Todo

https://github.com/OCA/maintainer-tools/wiki/Migration-to-version-15.0

Modules to migrate

• crm_event - By @stefan-tecnativa - [15.0][MIG] crm_event: Migration to version 15.0 #294
• event_email_reminder - By @victoralmau - [15.0][MIG] event_email_reminder: Migration to 15.0 #295
• event_mail - By @ernestotejeda - [15.0][MIG] event_mail: Migration to version 15.0 #312
• event_registration_cancel_reason - By @ernesto-garcia-tecnativa - [15.0][MIG] event_registration_cancel_reason: Migration to version 15.0 #302
• event_registration_partner_unique - By @ernesto-garcia-tecnativa - [15.0][MIG] event_registration_partner_unique: Migration to version 15.0 #301
• event_sale_reservation - By @victoralmau - [15.0][MIG] event_sale_reservation: Migration to 15.0 #296
• event_sale_session - By @ivantodorovich - [15.0] [MIG+REF / RFC] event_sale_session: Migration to 15.0 #276
• event_session - By @ivantodorovich - [15.0] [MIG+REF / RFC] event_session: Migration to 15.0 #275
• event_track_location_overlap - By @victoralmau - [15.0][MIG] event_track_location_overlap: Migration to 15.0 #299
• partner_event - By @stefan-tecnativa - [15.0][MIG] partner_event: Migration to version 15.0 #293
• sale_crm_event_reservation - By @stefan-tecnativa - [15.0][MIG] sale_crm_event_reservation: Migration to version 15.0 #300
• website_event_crm - By @chienandalu - [15.0][MIG] website_event_crm > website_event_crm_invitation: Migration to 15.0 #341
• website_event_filter_city - By @chienandalu - [15.0][MIG] website_event_filter_city: Migration to 15.0 #309
• website_event_questions_by_ticket - By @stefan-tecnativa - [15.0][MIG] website_event_questions_by_ticket: Migration to version 15.0 #307
• website_event_require_login - By @bizzappdev - [15.0][MIG]website_event_require_login: Migration to 15.0 #290
• website_event_sale_b2x_alt_price - By @chienandalu - [15.0][MIG] website_event_sale_b2x_alt_price: Migration to 15.0 #303

Missing module? Check https://github.com/OCA/maintainer-tools/wiki/%5BFAQ%5D-Missing-modules-in-migration-issue-list

[Camille0907]

website_event_sale_hide_ticket from 13.0 : #281

[Camille0907]

website_event_sale_single_attendee from 13.0 (from this pr) : #286

[Camille0907]

website_event_snippet_calendar from 13.0 (from this pr) : #288

[Camille0907]

event_sale_reserve_registration from 13.0 (from this pr) : #305