The Modern Events Calendar utilizes the fundamental setup of WordPress and can function seamlessly even with limited resources.
Host configurations: to access these fields, please edit the “php.ini” file, which is located in the host (if you can’t find it then contact your host service provider)
upload_max_filesize = 32M
post_max_size = 48M
memory_limit = 256M
max_execution_time = 600
max_input_vars = 10000
max_input_time = 400
Reference: https://wordpress.org/about/requirements/
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