Hi there Manoj,
Thanks for getting in touch with us and for your interest in Events Calendar PRO 🙂
Is my all events migrated in Pro version or not?
Yes, Events Calendar PRO works as an add-on for The Events Calendar so no further steps needed other than install and activate PRO.
Is the Post Type and Meta Keys are same in both Plugins.
Yes!
I have made some modification in the plugin. (I modified Some templates and changed the flow of venue. I am not using venue functionality provided by you. I am saving venues data as meta keys on same Post ID of event.) How i can handle this?
Well, there’s not much I can say about this as I’m not sure how you achieved this. If the core files have not been modified, and the customization of the templates is done as described in our themer’s guide then I’d say you are safe to install PRO and changes should persist.
Please let me know if there’s anything else I can help you with,
Best,
Nico