import frappe
from frappe.utils import get_datetime

def execute():
	weekdays = ["monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday"]

	weekly_events = frappe.get_list("Event", filters={"repeat_this_event": 1, "repeat_on": "Every Week"}, fields=["name", "starts_on"])
	frappe.reload_doc("desk", "doctype", "event")

	# Initially Daily Events had option to choose days, but now Weekly does, so just changing from Daily -> Weekly does the job
	frappe.db.sql("""UPDATE `tabEvent` SET `tabEvent`.repeat_on='Weekly' WHERE `tabEvent`.repeat_on='Every Day'""")
	frappe.db.sql("""UPDATE `tabEvent` SET `tabEvent`.repeat_on='Weekly' WHERE `tabEvent`.repeat_on='Every Week'""")
	frappe.db.sql("""UPDATE `tabEvent` SET `tabEvent`.repeat_on='Monthly' WHERE `tabEvent`.repeat_on='Every Month'""")
	frappe.db.sql("""UPDATE `tabEvent` SET `tabEvent`.repeat_on='Yearly' WHERE `tabEvent`.repeat_on='Every Year'""")

	for weekly_event in weekly_events:
		# Set WeekDay based on the starts_on so that event can repeat Weekly
		frappe.db.sql("""UPDATE `tabEvent` SET `tabEvent`.{0}=1 WHERE `tabEvent`.name='{1}'""".format(weekdays[get_datetime(weekly_event.starts_on).weekday()], weekly_event.name))

import frappe
from frappe.utils import get_datetime

def execute():
	weekdays = ["monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday"]

	weekly_events = frappe.get_list("Event", filters={"repeat_this_event": 1, "repeat_on": "Every Week"}, fields=["name", "starts_on"])
	frappe.reload_doc("desk", "doctype", "event")

	# Initially Daily Events had option to choose days, but now Weekly does, so just changing from Daily -> Weekly does the job
	frappe.db.sql("""UPDATE `tabEvent` SET `tabEvent`.repeat_on='Weekly' WHERE `tabEvent`.repeat_on='Every Day'""")
	frappe.db.sql("""UPDATE `tabEvent` SET `tabEvent`.repeat_on='Weekly' WHERE `tabEvent`.repeat_on='Every Week'""")
	frappe.db.sql("""UPDATE `tabEvent` SET `tabEvent`.repeat_on='Monthly' WHERE `tabEvent`.repeat_on='Every Month'""")
	frappe.db.sql("""UPDATE `tabEvent` SET `tabEvent`.repeat_on='Yearly' WHERE `tabEvent`.repeat_on='Every Year'""")

	for weekly_event in weekly_events:
		# Set WeekDay based on the starts_on so that event can repeat Weekly
		frappe.db.set_value('Event', weekly_event.name, weekdays[get_datetime(weekly_event.starts_on).weekday()], 1, update_modified=1)

Convert to SQL to set_value
fix: Convert to SQL to set_value