Try a D&D session scheduling poll (no sign-up)
See EventMoot from your players' side before you plan anything. Pick the evenings that suit you, vote on what the next session should be and say what you can bring, then see how the party's answers add up for the DM. No account needed, and nothing is saved.
Free to use. Entling, the free plan, doesn't expire, and your players never need an account.
Session 12: The Sunken Keep
Alex is the DM and wants to pin down the next session. This is exactly how your players would reply to your link.